get/put one over on somebody/something

put one over on

deceive someone into accepting something false. informal
See also: on, one, over, put

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.
See also: get, on, one, over, put, somebody, something