noun
Date: 14th century
one that tumbles: as, one who performs tumbling feats ; acrobat , any of various domestic pigeons that tumble or somersault backward in flight or on the ground, a drinking glass without foot or stem and originally with pointed or convex base,
3. a movable obstruction in a lock (as a lever, latch, wheel, slide, or pin) that must be adjusted to a particular position (as by a key) before the bolt can be thrown, a piece on which the mainspring acts in a gun's lock, a device or mechanism for tumbling (as a revolving cage in which clothes are dried), a worker who operates a tumbler, tumblerful noun
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