come off it

Related to come off it: come in handy, fall back on, set about, take account of, so much for

come off it

slang Stop it. This set phrase is usually used in the imperative and directed at one who is deemed to be acting foolishly. Oh, come off it, you're as smart as anyone in this program.
See also: come, off
Farlex Dictionary of Idioms.

Come off it!

 
1. Inf. Stop acting arrogantly! (See also come off ((of)something).)) Come off it, Tiff. You're not the Queen of England.
2. Inf. Give up your incorrect point of view! Come off it! You're wrong, and you know it!
See also: come, off
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

come off it

Stop acting or speaking foolishly or pretentiously, as in Oh come off it! you're no smarter than they are. This term, often used as an imperative, dates from the late 1800s, when it was usually put simply as come off.
See also: come, off
The American Heritage® Dictionary of Idioms by Christine Ammer.

come off it!

said when vigorously expressing disbelief. informal
See also: come, off
Farlex Partner Idioms Dictionary

come ˈoff it

(spoken) used to show that you do not believe somebody/something or that you disagree with somebody: ‘I can’t afford a holiday this year.’ ‘Come off it, you’ve got plenty of money.’
See also: come, off
Farlex Partner Idioms Dictionary

Come off it!

1. and Get off it! exclam. Stop acting arrogantly! Come off it, Tiff. You’re not the Queen of England. Get off it, you conceited slob!
2. exclam. Give up your incorrect point of view! You are arguing from a foolish position. You’re dead wrong. Get off it!
See also: come, off
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions

come off it

Slang
To stop acting or speaking foolishly or pretentiously. Often used in the imperative.
See also: come, off
American Heritage® Dictionary of the English Language, Fifth Edition.

come off it

Quit pretending or acting foolish or lying. Originally American slang dating from about 1900, it may, as one writer suggests, be related to coming down from a high perch or position of lofty pompousness (see on one’s high horse). W. Somerset Maugham, a master of realistic dialogue, wrote, “Come off it, Roy . . . I’m too old a bird to be caught with chaff ” (Cakes and Ale, 1930).
See also: come, off
The Dictionary of Clichés by Christine Ammer
See also:
  • Come off it!
  • get off it
  • Get off it!
  • all the best
  • clear the way
  • carry on with (something)
  • chill out
  • calm down
  • carry on
  • buck up