assurer

To insure (assurer sa voiture) and to assure/ensure (je t'assure que c'est vrai) — and, in everyday informal speech, a completely different colloquial sense: to be really good at something or to come through under pressure (il assure, elle a assuré à l'oral). That slang use is extremely common among younger speakers.

• Il a assuré sa maison contre l'incendie. — He insured his house against fire.
• Je t'assure que je n'ai rien fait. — I assure you I didn't do anything.
• Elle assure grave à la guitare. — She's really good at guitar.

The casual 'il assure' (he's got it, he's killing it) has nothing to do with insurance or assurance — learners who only know the literal senses will misread this common slang compliment.

• expression "Il assure" — Well-documented colloquial French slang, used especially by younger speakers, meaning someone is impressive or performing very well — distinct from the literal 'to insure/assure' senses.