Where does “duimen” come from?

duimen (Dutch) comes from Dutch duim, from Middle Dutch dume, from Old Dutch thūmo, 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.

duimen (Dutch): to put one or both thumbs up, notably as a...

Definitions

to put one or both thumbs up, notably as a...

Ancestry of “duimen”, step by step

Step	Language	Word	Meaning
1	Dutch	duim	thumb, the inner-most finger; inch; pintle
2	Middle Dutch	dume	—
3	Old Dutch	thūmo	—
4	Proto-West Germanic	þūmō	thumb
5	Proto-Germanic	þūmô	thumb
6	Proto-Indo-European	tūm-	to grow; to swell, to increase; to swell, be...
7	Proto-Indo-European	tewh₂-	to swell; to crowd; to be strong

Every word from Proto-Indo-European tewh₂- →Every word from Proto-Indo-European tūm- →Every word from Proto-Germanic þūmô →