blow the whistle on

(informal)bring an illicit activity to an end by informing on the person responsible

(非正式)终止不合法活动；告发，揭发

(as) clean as a whistle

extremely clean or clear

洁净；清清楚楚

whistle something down the wind

let something go; abandon something

放走，听其自由；放弃

whistle in the wind

try unsuccessfully to influence something that cannot be changed

徒然无功

blow the whistle&I{【俚语】}

To expose a wrongdoing in the hope of bringing it to a halt

揭发：怀着使违法行为得以中止的希望而告发

an attorney who blew the whistle on governmental corruption.

一个揭发政府腐败的律师

whistle in the dark

To attempt to keep one's courage up.

给自己壮胆：试图鼓起某人的勇气