Where does “éteint” come from?

éteint (French) comes from Old French esteint, from Latin extīnctus, from Latin extinguo, from Latin stinguo, from Proto-Italic *stengʷō.

éteint (French): third-person singular present indicative of...

Definitions

Step	Language	Word	Meaning
1	Old French	esteint	—
2	Latin	extīnctus	—
3	Latin	extinguo	I quench, extinguish, kill
4	Latin	stinguo	I put out, extinguish
5	Proto-Italic	*stengʷō	—

éteint — Etymology, Origin & Word History | Etymology Explorer