Webster's English Dictionary

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tumbler

tum.bler \'t*m-bl*r\ n 1: one that tumbles : as  1a: one that performs 
   gymnastic feats : ACROBAT  1b: any of various domestic pigeons that tumble 
   or somersault backward in f light or on the ground 2: a drinking glass 
   without foot or stem and orig. with pointed or convex b ase 3a: a movable 
   obstruction in a lock (as a lever, latch, wheel, slide, or pi n) that must 
   be adjusted to a particular position (as by a key) before the bolt can be 
   thrown 3b: a piece on which the mainspring acts in a gunlock  3c1: a 
   projecting piece on a revolving shaft or rockshaft for actuating ano ther 
   piece 3c2: the movable part of a reversing or speed-changing gear  4: a 
   device or mechanism for tumbling (as a revolving cage in which clothes  are 
   dried) 5: a worker that operates a tumbler