tumbler
tum·bler / ˈtəmblər/ • n. 1. a drinking glass with straight sides and no handle or stem.2. an acrobat or gymnast, esp. one who performs somersaults. ∎ a pigeon of a breed that repeatedly turns over backward in flight.3. a pivoted piece in a lock that holds the bolt until lifted by a key. ∎ a notched pivoted plate in a gunlock.4. another term for tumbling barrel.DERIVATIVES: tum·bler·ful / -ˌfoŏl/ n. (pl. -fuls) .
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tumbler