Where does “třmen” come from?

třmen (Czech) comes from Old Czech [[střmen]], [[třmen]], [[střemen]], [[třemen]], from Proto-Slavic stremę, from Proto-Slavic -mę.

třmen (Czech): stirrup

Definitions

Step	Language	Word	Meaning
1	Old Czech	[[střmen]], [[třmen]], [[střemen]], [[třemen]]	—
2	Proto-Slavic	stremę	stirrup
3	Proto-Slavic	-mę	—

třmen — Etymology, Origin & Word History | Etymology Explorer