看绝望的主妇学高频短语：Rat sb out

Rat sb out: To inform an authority figure of one’s bad or illegal behavior;to expose or reveal embarrassing information about someone.If someone rats you out, they are disloyal to you, especially by telling someone in authority about something wrong that you have done.

中文释义：rat 的意思不只表示大老鼠，还可以指卑鄙的人，骗子，所以 rat sb out在这里引申为告密，出卖，等同于sell sb out(或者rat on sb or sth)。例句：You can’t rat out your teammates.（你不能告发你的队友。）另外，与rat相关的口语表达还有：rat race过于激烈的竞争；look like a drowned rat落汤鸡；smell a rat有猫腻/不对劲儿；pack rat不可靠的人，有敛癖的人。