From Longman Dictionary of Contemporary EnglishRelated topics: Jail & punishmentthumbscrewthumb‧screw /ˈθʌmskruː/ noun [countable]SCJan object that was used in the past to punish people by crushing their thumbsExamples from the Corpusthumbscrew• If you're in Error you are one step away from the thumbscrews.• To open the lid, you simply loosen two thumbscrews.
PAKcw English - Korean Dictionary
[θ∧mskr`u:] n. 나비나사, 엄지손가락을 죄는 형틀
Quick English Korean
thumbscrew n, 나비나사, 엄지손가락을 죄는 형틀
screw which may be screwed in with fingers; torture device