thumbscrew

1 ENTRIES FOUND:
thumbscrew /ˈθʌmˌskruː/ noun
plural thumbscrews
thumbscrew
/ˈθʌmˌskruː/
noun
plural thumbscrews
Britannica Dictionary definition of THUMBSCREW
[count]
1 
: a device used in the past to torture people by crushing their thumbs — sometimes used figuratively
2 
: a type of screw with a flat-sided head that can be held and turned with your thumb and fingers