slip one over on (someone)

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slip one over on (someone)

To con, deceive or take advantage of someone; to make a fool of or hoodwink someone. My little brother always thinks he can slip one over on me, but I'll be the one to get the last laugh next time! Beware of these street vendors selling tacky souvenirs. They're usually just trying to slip one over on you.
See also: on, one, over, slip

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

slip one over on

Informal
To hoodwink; trick.
See also: on, one, over, slip