avertir

/avɛʁtiʁ/
1.
verbInf2nd

warn

caution (advise someone of danger or possible negative consequences)

Je t'ai averti : si tu recommences, je m'en vais.

I warned you: if you do it again, I'm leaving.

2.
verbInf2nd

inform

notify

let someone know

N'oublie pas de m'avertir quand tu seras arrivé.

Don't forget to let me know when you've arrived.