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The Collaborative International Dictionary of English v.0.48 (gcide)

Tumbler \Tum"bler\, n.
1. One who tumbles; one who plays tricks by various motions
of the body; an acrobat.
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2. A movable obstruction in a lock, consisting of a lever,
latch, wheel, slide, or the like, which must be adjusted
to a particular position by a key or other means before
the bolt can be thrown in locking or unlocking.
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3. (Firearms) A piece attached to, or forming part of, the
hammer of a gunlock, upon which the mainspring acts and in
which are the notches for the sear point to enter.
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4. A drinking glass, without a foot or stem; -- so called
because originally it had a pointed or convex base, and
could not be set down with any liquor in it, thus
compelling the drinker to finish his measure.
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5. (Zool.) A variety of the domestic pigeon remarkable for
its habit of tumbling, or turning somersaults, during its
flight.
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6. (Zool.) A breed of dogs that tumble when pursuing game.
They were formerly used in hunting rabbits.
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7. A kind of cart; a tumbrel. [Prov. Eng. & Scot.]
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