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IELTS BNC: 1960 COCA: 2078

signal

Word family 
Related topics: Broadcasting, Trains & railways
sig·nal1 /ˈsɪɡnəl/ ●●● S2 W2 noun [countableC]
1  SIGN/GESTUREa sound or an action that you make in order to give information to someone or tell them to do something 信號；暗號
signal (for somebody) to do something
When she got up from the table, it was obviously the signal for us to leave.
她從桌邊站起來，這顯然是要我們離開。
At a prearranged signal the lights went out.
預定的信號一發出，燈就全滅了。
→ smoke signal► see thesaurus at sign
2  SIGN/INDICATIONan event or action that shows what someone feels, what exists, or what is likely to happen 信號；標志；預示
signal (that)
These results are a signal that the child may need special help.
這些結果表明這個孩子可能需要特别的幫助。
signal of
The opinion poll is a clear signal of people’s dissatisfaction with the government.
此次民意調查清楚地表明了民衆對政府的不滿。
the danger signals of a heart attack
心髒病發作的危險信號
send/give out a signal 發出信號
We don't want to give out the wrong signal to investors.
我們不想向投資者發出錯誤的信號。
3  TCBa series of light waves, sound waves etc that carry an image, sound, or message, for example in radio or television 〔無線電、電視等的〕信號
send/transmit a signal
This new pay-TV channel sends signals via satellite to cable companies.
這個新的付費電視頻道通過衛星把信號發送到有線電視公司。
receive/pick up/detect a signal 接收信號
a small antenna which can receive radio signals
可以接收無線電信號的小型天線
The coastguard picked up a distress signal from a freighter 50 miles out at sea.
海岸警衛隊接收到一艘離海岸 50 英裏的貨船發來的求救信號。
4  TTTa piece of equipment with coloured lights, used on a railway to tell train drivers whether they can continue or must stop 〔鐵路的〕信號燈，指示燈
a stop signal
停車信號燈
a signal failure (=when these lights do not work)
信號燈故障
→ busy signal at busy1(4)
 COLLOCATIONS – Meaning 2: an event or action that shows what someone feels, what exists, or what is likely to happen 信號；標志；預示
ADJECTIVES/NOUN + signal
a clear/strong signal 明確的信號
My body was giving me a clear signal that something was wrong.
身體向我發出明確信號,我的健康出問題了。
a warning/danger/alarm signal (=a signal showing that there is danger) 警告/危險/報警信號
Managers should keep a watchful eye open for the danger signals.
管理人員應時刻警惕危險信號。
the wrong signals (=ones that do not give a true account of a situation) 錯誤信號
nReducing the penalty for marijuana use perhaps sends the wrong signal to teenagers.
nmixed signals (=ones that are confusing because they seem to show two different things)
Our culture gives girls mixed messages about food, with skinny models and fast-food commercials competing for attention.
verbs
send/give out a signal 發出信號
The use of the army sends out a clear signal to protesters that their actions will not be tolerated.
動用軍隊是向抗議者發出明確信號,他們的行爲是不能容忍的。
read the signals (=to understand signals correctly) 讀懂信號
President Nixon read the signals and decided it was time to resign.
尼克鬆總統讀懂了信號,認爲應該辭職了。
 COLLOCATIONS – Meaning 3: a series of light waves, sound waves etc that carry an image, sound, or message, for example in radio or television 〔無線電、電視等的〕信號
verbs
send (out)/transmit a signal 發送信號
The signals are transmitted via satellites.
這些信號通過衛星傳送。
emit a signal (=sends one out) 發出信號
The device emits a signal which can be picked up by a submarine.
該設備發出一個信號,可以被潛水艇接收。
receive/pick up a signal 接收信號
The antenna that will pick up the signals is a 12-metre dish.
接收這些信號的天線是一個直徑 12 米的碟形裝置。
carry a signal (=allow it to travel along or through something) 傳輸信號
nCopper wires carry the electrical signals.
na signal travels (=goes across space, along a wire etc)
The signal travels over the cable network.
ADJECTIVES/NOUN + signal
strong 強的
I can’t use my phone because the signal isn’t strong enough here.
我的手機不能用,因爲這裏信號不夠強。
weak/faint 弱的
The signals were too weak for the receiver to pick up.
信號太弱,接收器收不到。
a radio/electrical/radar signal 無線電/電/雷達信號
nA transmitter connected to the door bell sends radio signals to a portable receiver.
a digital signal 數字信號
nDigital signals can be compressed to take up less space.
Examples from the Corpus
signal• This ability to adjust signals is a mechanism for learning.• The telephone changes sound waves into electrical signals.• Moma Parsheen had sent the exterminatus signal just over a week earlier.• Stock brokers use roughly 300 hand signals on the trading floor.• The biggest surprise was the sudden reappearance of the radio signals.• As humans we can transmit messages to each other by speaking, writing, morse code, semaphore and smoke signals.• During mating season, female butterflies respond to subtle signals from the males.• We just sat there, waiting for the signal to turn green.• The soldiers were waiting for the signal to start firing.• Don't start yet - wait until I give the signal.• When the insect is ready to mature, juvenile hormone secretion must stop and allatostatin provides the signal.• When I nod my head, that's the signal for you to start playing the music.• It can fine-tune the signal the receptors pass on, and it can change the number of receptors.• That was the signal for us to leave.• The signals just get louder and louder.
signal (for somebody) to do something• He tapped Oliver's arm and signalled him to follow.• Your negative attitude may be the best signal you have to begin rebuilding a relationship before it is too late.• The footmen looked relieved to see me, and I immediately signalled them to get to their positions.• She signalled the nomes to follow her.• Echoes of the signal alert them to possible prey, at ranges up to 80-90 metres in shallow waters.• That was the signal for us to leave.• These signals falsely indicated to the on board systems that the spacecraft was safely on the surface.• The best early warning signal is to be aware of your own attitude.
signal (that)• The unemployment figures are a signal that the economy is improving.• Then he became instrumental in a signal deliverance for his country.• For the hopeful, increased use of leave signals social progress, greater sharing by fathers.• The current cell state determines the response rather than the particular signal.• You of course have your own list of physical signals.• This is to ensure that you saw the signal.• Many analysts fault Oxygen's decision to charge cable operators to carry their signals for its failure to take off.• This signal can be either excitatory or inhibitory.• George Salem of Prudential Securities is one who signals caution, however.
signal failure• A signalling failure is believed to have been the cause.• Driver training should emphasise signal failures and their reporting.
signal2 ●○○ verb (signalled, signalling British EnglishBrE, signaled, signaling American EnglishAmE)
1  [intransitiveI, transitiveT]SIGN/GESTURE to make a sound or an action in order to give information or tell someone to do something 發信號，打信號；示意
She signalled, and the waiter brought the bill.
她打了個手勢，侍者就拿來了賬單。
The whistle signalled the end of the match.
哨聲吹響，示意比賽結束。
signal at
Mary signalled wildly at them, but they didn’t notice.
瑪麗拼命向他們做手勢，但他們沒注意到。
signal to
The judge signaled to a police officer and the man was led away.
法官向一名警察示意，於是那個人就被帶走了。
signal for
He pushed his plate away and signalled for coffee.
他把盤子推開，示意要杯咖啡。
signal (to) somebody to do something
She signalled to the children to come inside.
她示意孩子們進來。
signal that
The bell signaled that school was over.
鈴聲響起表示放學。
2  [transitiveT]CLEAR/EASY TO UNDERSTAND to make something clear by what you say or do – used in news reports 〔用語言或行動〕表明，表示〔用於新聞報道〕
Both sides have signaled their willingness to start negotiations.
雙方都表示了啓動談判的意願。
British sources last night signalled their readiness to talk.
英國方面昨晚表示願意對話。
signal (that)
The prime minister’s speech today signals that there will be a shakeup in the cabinet.
首相今天的講話表明内閣將進行改組。
3  [transitiveT]SHOW/BE A SIGN OF to be a sign that something is going to happen 標志着，預示
signal the start/beginning/end of something
the lengthening days that signal the end of winter
白晝變長標志着冬天的結束
4  [intransitiveI] to show the direction you intend to turn in a vehicle, using the lights 〔車輛轉向時〕打燈示意 SYN American English indicate
Signal before you pull out.
駛離路邊時先要打燈示意。
Examples from the Corpus
signal• The fires burned through the night, signalling across the forest that the era of the rajathuk was at an end.• Slowly he inched around the corner, signalling for the others to follow.• He'd been signaling his desire to leave for over a year.• The driver in front of us was signaling left, but he didn't turn off.• But three recent cases are piquing our interest, and analysts say they may signal new and more venal form of corruption.• The threshold is achieved on both input processing elements, so both elements fire and pass signals on to the middle layer.• For the hopeful, increased use of leave signals social progress, greater sharing by fathers.• An official signalled that it was time for the race to begin.• Again and again Cheryl signalled the message, hoping desperately that Angela would read it.• But he admits that his self-control snapped sufficiently for him to signal the score, 3-1 to West Ham.• The melting of the ice on the lake signals the start of spring.• The display will flash "L, " signaling the user to change the batteries.• Most of the processing would be done remotely, signalling to the lens via a radio link.• Graham finished his drink and signalled to the waiter.• A sailor began signalling with two flags.
signal that• The beach community tightened law enforcement, signaling that college students weren't welcome during spring break.• Or did it signal that face time was being given credit over productivity?• Don instantly interprets such feelings as signals that he is dangerously abnormal.• Last week, Francis sent out the strongest possible signal that he won't settle for second best at Sheffield Wednesday.• That was the familiar signal that Hrudey was going in for struggling goalie Byron Dafoe.• Without this information, the controllers only see a radar screen with signals that indicate planes.• Again, the Brapid busy signal that meant no connection.• It also sent a signal that Mr Lamont sees his long-term future at the Treasury.• There were scattered signals that something was wrong, investigators say, but the system failed to respond.
signal (that)• The current cell state determines the response rather than the particular signal.• This is to ensure that you saw the signal.• You of course have your own list of physical signals.• This signal can be either excitatory or inhibitory.• George Salem of Prudential Securities is one who signals caution, however.• Then he became instrumental in a signal deliverance for his country.• Many analysts fault Oxygen's decision to charge cable operators to carry their signals for its failure to take off.• For the hopeful, increased use of leave signals social progress, greater sharing by fathers.
signal the start/beginning/end of something• But for thousands of serious-minded students across the country, the holiday signals the start of exam season.• He continued to box until 1910 when a deteriorating eye condition signalled the end of his active career.• In fact, it is the greed that serves to signal the start of his entrepreneurship.• Would the moment of conquest signal the end of his interest in her?• Postmodernism does not signal the end of politics or the creation of forms which are emptied of political content.• In a sense, it will signal the end of the centuries-old dominance of the printed word.• The peace is broken by the bell that signals the end of the day.
signal3 adjectiveadj [only before noun] formal
IMPORTANTimportant 重要的
signal achievement/success/failure etc
The university has done me the signal honour of making me an Honorary Fellow.
這所大學授予我榮譽院士頭銜，讓我深感榮幸。
Examples from the Corpus
signal• Headlight controls are on the turn signal stalk, wiper controls on another stalk to the right of the steering wheel.• They may act as signal warning for developments in other fields.
signal achievement/success/failure etc• She also conveyed the supreme values of the classical past with signal success.• Driver training should emphasise signal failures and their reporting.• A signalling failure is believed to have been the cause.
Origin signal1
(1300-1400) Old French signale, from Medieval Latin, from Late Latin signalis “of a sign”, from Latin signum; → SIGN1
 signal3
(1600-1700) French signalé, past participle of signaler “to show a difference between”, from Old Italian segnalare, from Medieval Latin signale; → SIGNAL1

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