Verb: Thimblerig (THIM-bul-rig)
1. To cheat by trickery
2. To swindle by a trick in which a small ball or pea is quickly shifted from under one to another of three small cups to fool the spectator guessing its location.
Sample sentence: The appraiser looked closely at the painting to make sure the seller was not trying to thimblerig us into buying a worthless copy.