
1) Instrument of torture 2) Music-box winder 3) Piece of hardware 4) Torture device
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https://www.crosswordclues.com/clue/thumbscrew

- instrument of torture that crushes the thumb
- screw designed to be turned with the thumb and fingers
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[torture] The Thumbscrew or pillywinks is a torture instrument which was first used in medieval Europe. It is a simple vice, sometimes with protruding studs on the interior surfaces. The victim`s thumbs or fingers were placed in the vice and slowly crushed. The thumbscrew was also applied to crush prisoners` big toes. The crushing bars were...
Found on
http://en.wikipedia.org/wiki/Thumbscrew_(torture)

• (n.) An old instrument of torture for compressing the thumb by a screw; a thumbkin. • (n.) A screw having a flat-sided or knurled head, so that it may be turned by the thumb and forefinger.
Found on
http://thinkexist.com/dictionary/meaning/thumbscrew/
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.
Found on
http://www.encyclo.co.uk/webster/T/52

[
n] - instrument of torture that crushes the thumb 2. [n] - screw designed to be turned with the thumb and fingers
Found on
http://www.webdictionary.co.uk/definition.php?query=thumbscrew
No exact match found.