what mean of Kick-off?

kick off有好幾種解釋
一）start a football match(by kicking the ball)(足球:開球)
e.g. United kicked off and scored almost immediately(聯隊開球後旋即得分)
二)kick (sth) off=begin(a meeting etc.)開始
e.g. I'll ask Tessa to kick off (the discussion).我叫特薩開始(討論)
三)kick sth off=踢掉某物
e.g. Kick off one's slippers(踢脫拖鞋)
但因為你的字是連在一起kick-off，就是指start of a football match（足球比賽的）開球

Kick-off 亦常用於一系列活動的開啟典禮中。

Which means something to be started. For example: A project is to be started. "Kick-off" meeting is frequently to be used. It means a meeting for the preparation of starting a project or an event.

kick off 指球員把放在中圈中央點的球踢動，即足球賽開始。比喻用於其他情況，亦是指事情開始。

問字最好有全句列出，比較易理解。

1. 【足】開球
It started raining right after the kickoff of the soccer game.
足球賽一開球就開始下雨了。

2. 【口】(社交集會等的)開始
We had a project kickoff meeting this morning.
我們今天上午開了個項目開始的會議。