come off it
come off it also get off it {v. phr.}, {slang}
Stop pretending; bragging, or kidding; stop being silly. — Used as a command.
"So I said to the duchess..." Jimmy began. "Oh, come off it," the other boys sneered.
Fritz said he had a car of his own. "Oh, come off it," said John. "You can't even drive."
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Source: A Dictionary of American Idioms
