come off it
US /kʌm ɔf ɪt/
UK /kʌm ɔf ɪt/

1.
别傻了, 别胡说
used to tell someone that you do not believe what they are saying, or that you disagree with it
:
•
Oh, come off it, you don't really believe that, do you?
哦,别傻了,你不会真相信那个吧?
•
Come off it, you know that's not true.
别傻了,你知道那不是真的。