get one over on (one)
To fool or deceive one; to make one the victim of a prank or hoax. I'm not as naïve as I once was, so you won't be getting one over on me again! The con man spotted Jane from a mile away, and quickly figured out how he would get one over on her.
get/put one ˈover on somebody/something
(informal) get an advantage over somebody/something: I’m not going to let them get one over on me!Don’t believe a word he says. He’s just trying to put one over on you.