Definition of thumbpiece

  1. 1 :  an appendage to a handle (as of a vessel) to afford a hold for the thumb

  2. 2 :  a part designed to be operated by the thumb or thumb and fingers: such as a :  a small inside knob for a night latch b :  a small knob or button to operate a catch (as on a bracelet)

  3. 3 dialectal :  a small amount of food

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a brief usually trivial fact

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