off是关。Off和on在机器开关上，一般on是开，off是关的意思。这主要是因为英文只中的两个短语turn on为打开，turn off为关掉之意。off是一个英语单词，可以用作介词、形容词、副词、动词、名词。Off作为名词时，是起跑的意思，off作为动词时，是杀死(某人)的意思。

　　I called him but he ran off.我喊他，可他跑开了。Sarah's off in India somewhere.萨拉远在印度某地。I must be off soon.我必须很快离开这里。

　　Off you go!你走吧！Summer's not far off now.夏天已近在眼前了。A solution is still some way off.解决办法尚需时日。The wedding is off.婚礼被取消了。

　　He's had his beard shaved off.他把胡子刮掉了。Take your coat off.脱了外衣吧。Don't leave the toothpaste with the top off.牙膏要盖上盖。