wax and wane

ALCHANGE/BECOME DIFFERENTto increase and decrease over time 兴衰，荣枯

Interest in the show has waxed and waned.

人们对这个节目曾经颇有兴趣，现已热情不再。

Examples from the Corpus

wax and wane• Over the years, there have been fundamental shifts in policy and strategy as attitudes toward the rural poor wax and wane.• Controversy about essential hypertension has waxed and waned for a century, and what is orthodox today may change with time.• Historical Romances continued to appear throughout the century, waxing and waning in numbers and popularity as public taste dictated.• Is it present constantly, does the sensation wax and wane, or does it come in acute attacks?• Although the Alsops' fortunes waxed and waned through the eighteenth and nineteenth centuries, certain family characteristics remained distinct.

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wax and wane

To become larger: grow, expand, swell...

To become smaller: shrink, contract, compact...