"only a rotter would do that" "kill the rat" "throw the bum out" "you cowardly little pukes!" "the British call a contemptible person a `git'"
"He told on his classmate who had cheated on the exam"
That coward ratted on his fellow-workers.
那个胆小鬼告发了和他一起干活的工人。
The police know we're here.Someone must have ratted on us.
警察知道我们在这儿,一定是有人背叛了我们。
We shouldn't rat on our promise.
我们不应该违背诺言。
When the rat protested that he loved Sal, she chucked a drink in his face.
Witnesses..ratting on former colleagues.
He's a solicitor who's ratted on a client! He could be struck off for that, you know!
牛津高阶第八版
美国韦氏词典
Dictionary.com
Free Dictionary
维基百科 (自由的百科全书)