inform against sb.;give secret information against sb.;blow the gab;nose;peach ;

The whistleblower was fired for exposing the conditions in mental hospitals.
告密者由于泄漏精神病院的情况而被解雇.
来源:互联网摘选The gang leader decided that the informer must be taken for a ride.
歹徒头目决定要将告密者用汽车绑架去干掉.
来源:《简明英汉词典》He was repeatedly attacked by other inmates, who accused him of grassing.
他屡遭指责他告密的其他囚犯的殴打。
来源:《柯林斯高阶英汉双解学习词典》When he was doing underground work he was arrested because a renegade informed against him.
他做地下工作时,曾因叛徒告密而被捕.
来源:《现代汉英综合大词典》
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