off是關。Off和on在機器開關上，一般on是開，off是關的意思。這主要是因為英文只中的兩個短語turn on為開啟，turn off為關掉之意。off是一個英語單詞，可以用作介詞、形容詞、副詞、動詞、名詞。Off作為名詞時，是起跑的意思，off作為動詞時，是殺死(某人)的意思。
I called him but he ran off.我喊他，可他跑開了。Sarah's off in India somewhere.薩拉遠在印度某地。I must be off soon.我必須很快離開這裡。
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.解決辦法尚需時日。The wedding is off.婚禮被取消了。
He's had his beard shaved off.他把鬍子刮掉了。Take your coat off.脫了外衣吧。Don't leave the toothpaste with the top off.牙膏要蓋上蓋。
