This is the 12352nd most frequent French word.
éteindra
"Éteindra" means "will turn off" or "will extinguish" in English.
Here, "éteindra" is used in the context of turning off an electrical appliance, specifically lights.
Il éteindra les lumières avant de partir.
He will turn off the lights before leaving.
In this case, "éteindra" metaphorically refers to calming or reducing an emotion, symbolizing the extinguishing of fire or anger.
Je pense qu'il éteindra sa colère avec une conversation calme.
I think he will extinguish his anger with a calm conversation.
The word "éteindra" here refers to putting out a flame, in this instance a candle flame.