verb/fɛʁ.me/
to shut; to close; to do up (of clothing); to switch off, to turn off (of a device or an appliance); to shut down, to discontinue, to axe (of a service)
“Ce professeur l'a fermé au sujet des mathématiques.” — That teacher turned him off maths.
Inherited from Old French fermer (“to close”), Latin firmāre (“make firm, confirm”).