To kick off is to begin an event. Kick off at three, kick off the meeting, the season kicks off.
It comes from football, where the kick off literally starts play. In British slang it also means for trouble to break out, which is a quite separate use.
1phrasekick offTo begin an event.
“The conference will kick off with a short film.”
kick off is a phrase.
Practised in Phrasal Verbs