Free & Quick Proofreading from Grammarly!

thumbscrew Meaning, Definition & Usage

  1. noun instrument of torture that crushes the thumb
  2. noun screw designed to be turned with the thumb and fingers

Thumb"screw` noun
  1. A screw having a flat-sided or knurled head, so that it may be turned by the thumb and forefinger.
  2. An old instrument of torture for compressing the thumb by a screw; a thumbkin.

Webster 1913