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VERB
(向当权者)告发，告密
To snitch on a person means to tell someone in authority that the person has done something bad or wrong.
例句
She felt like a fifth-grader who had snitched on a classmate.
她觉得自己就像一个告发了同班同学的五年级学生。
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N-COUNT
告密者;告发者
A snitch is a person who snitches on other people.
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VERB
偷窃
If you snitch something, you steal it quickly and quietly.
例句
Before I'd finished reading it, she snitched my copy of To Kill a Mockingbird.
我还没有读完我那本《杀死一只知更鸟》，她就把书给偷走了。