palm something off on someone
palm (something) off (on one) (as something else)
To try to get rid of something by giving or selling it to someone under the pretense of it being something else. There are always guys palming off cheap watches as Rolexes in this part of town. She tried to palm off the crappy assignment on me as some kind of special challenge.
palm something off (on someone)
tv. to succeed in spending counterfeit money; to succeed in cashing a bad check. (Underworld.) Max palmed four phony twenties off in less than an hour.