thumb·screw /-ˌskru/
翼形螺釘,拇指夾
thumbscrew
翼形螺
Thumb·screw n.
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.
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thumbscrew
n 1: instrument of torture that crushes the thumb
2: screw designed to be turned with the thumb and fingers