Thumbscrew (noun)

  1. A device for compressing or crushing objects, consisting of a screw that is turned with the thumb and fingers.
  2. A medieval instrument of torture that was used to crush a person's fingers.

Origin:

From middle english thomscrew, from old english þum-screaw, from þum + screaw ("screw").

Examples:

  1. The mechanic used a thumbscrew to tighten the bolts on the engine.
  2. The thumbscrew was a brutal tool of the inquisition.
  3. He used the thumbscrew to secure the wires in place.
  4. The thumbscrew was a simple but effective device.
  5. The thumbscrew was used as a form of punishment in ancient times.
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