noun 1.a sleight-of-hand swindling game in
which the operator palms a pellet or pea while appearing to cover it with one of three thimblelike cups, and then, moving the cups about, offers to bet that no one can tell under which cup the pellet or pea lies.
verb (used with object) 2.to cheat by or as by the thimblerig.
Related forms thim·ble·rig·ger, noun