rat out

US /ræt aʊt/
UK /ræt aʊt/
"rat out" picture
1.

告发, 出卖

to inform on someone, especially to an authority

:
He threatened to rat out his accomplice if he didn't get a bigger share.
他威胁说,如果得不到更大的份额,就会告发他的同伙。
Don't rat out your friends, it's not cool.
不要告发你的朋友,那不酷。