slip something 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.
See also: on, over, slip, something

slip something over on

Hoodwink, trick, as in Her lawyer tried to slip one over on him, but his lawyer wouldn't let him get away with it , or Don't trust Dan-he's always slipping something over on his customers. [c. 1900]
See also: on, over, slip, something