Definition of thimblerigging:
(n) :
A game of skill which requires the bettor to guess under which of three small cups (or thimbles) a pea-sized object has been placed after the party operating the game rapidly rearranges them, providing opportunity for sleight-of-hand trickery; a shell game.
(n) :
One operating such a game.
(v) :
(ambitransitive, figuratively) To cheat (someone) by trickery.
(v) :
(intransitive) To cheat in the thimblerig game.