Where does “thumbscrew” come from?

thumbscrew (English) comes from English thumb, from Middle English þombe, from Old English þūma, from Proto-West Germanic þūmō, from Proto-Germanic þūmô, from Proto-Indo-European tūm-, from Proto-Indo-European tewh₂- — to swell; to crowd; to be strong.

thumbscrew (English): A screw that can be turned with the thumb and...

Definitions

  1. A screw that can be turned with the thumb and...

Ancestry of “thumbscrew”, step by step

thumbscrew traces back through two separate lines of ancestry.

via English thumb

StepLanguageWordMeaning
1EnglishthumbThe short thick digit of the hand that for humans...
2Middle Englishþombethumb; thumb-length; big toe
3Old Englishþūmathumb
4Proto-West Germanicþūmōthumb
5Proto-Germanicþūmôthumb
6Proto-Indo-Europeantūm-to grow; to swell, to increase; to swell, be...
7Proto-Indo-Europeantewh₂-to swell; to crowd; to be strong

via English screw

StepLanguageWordMeaning
1EnglishscrewA device that has a helical function; The motion...
2Middle Englishscrew
3Old Frenchescrouenut, cylindrical socket, screwhole; scroll, strip...
4Latinscrofasow
5Proto-Indo-European(s)kerbʰ-to scratch, scrape
6Proto-Indo-European(s)ker-to cut off; to turn, bend
7Proto-Indo-Europeansek-to cut, cut off, sever
Every word from Proto-Indo-European tewh₂-Every word from Proto-Indo-European tūm-Every word from Proto-Germanic þūmô