thumbscrew Meaning, Definition & Usage
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noun instrument of torture that crushes the thumb
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noun screw designed to be turned with the thumb and fingers
WordNet
Thumb"screw` noun
Definitions
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A screw having a flat-sided or knurled head, so that it may be turned by the thumb and forefinger. -
An old instrument of torture for compressing the thumb by a screw; a thumbkin.
