(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
extremely clean or clear
洁净；清清楚楚
let something go; abandon something
放走，听其自由；放弃
try unsuccessfully to influence something that cannot be changed
徒然无功
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
To attempt to keep one's courage up.
给自己壮胆：试图鼓起某人的勇气