kick off

Short definition from Wiktionary

Verb

1. 1
   To make the first kick in a game or part of a game.
2. 2
   To start; to launch; to set in motion.
3. 3
   To dismiss; to expel; to remove from a position.
4. 4
   To die or quit permanently.
5. 5
   To shut down or turn off suddenly.
6. 6
   To suddenly become more active.
7. 7
   To force the weaning of a bovine cow's calf by restricting the calf's access to its mother's udders, whether by literally kicking it away or another method.
8. 8
   To be overcome with anger, to start an argument or a fight; to behave aggressively.
9. 9
   To have a fight or argument start; to fight or argue.

Noun

1. 1
   The opening kick of each half of a game of football.
2. 2
   The opening sequence of any event.
3. 3
   The opening sequence of notes in a song, usually played by the song's main instrument, to indicate the beginning of the song.