slip over on
slip something over on (one)
To con, deceive or take advantage of one; to make a fool of or hoodwink one. Hey, these aren't real pearls! Are you trying to slip something over on me? Beware of deals advertised online that sound too good to be true. They're usually just trying to slip something over on you.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
slip something over on someone or somethingand slip one over on someone or something; slip something over; slip one over
to deceive someone. Are you trying to slip something over on me? I think he tried to slip one over on me.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.