aver
Word family verbavernounaverment
a·ver /əˈvɜː $ əˈvɜːr/ verb (averred, averring) [transitiveT] formalTRUE to say something firmly and strongly because you are sure that it is true 断言;坚称 SYN declare Origin aver (1300-1400) Old French averer, from Medieval Latin adverare “to show to be true”, from Latin ad- “to” + verus “true”