Illustration of thumbscrew
 
 - thumbscrew 2
| 单词 | thumbscrew | 
| 释义 | thumbscrewnoun  thumb·screw  ˈthəm-ˌskrü  1   : an instrument of torture for compressing the thumb by a screw   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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