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thumbscrew

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noun thumb·screw \-ˌskrü\

Simple Definition of thumbscrew

  • : a device used in the past to torture people by crushing their thumbs

  • : a type of screw with a flat-sided head that can be held and turned with your thumb and fingers

Source: Merriam-Webster's Learner's Dictionary

Full Definition of thumbscrew

  1. 1 :  an instrument of torture for compressing the thumb by a screw

  2. 2 :  a screw having a flat-sided or knurled head so that it may be turned by the thumb and index finger



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