ph.

1. 关闭;关上;使停止运转
If you shut off something such as an engine or an electrical item, you turn it off to stop it working.

2. (通常因沮丧而)躲开他人，不见人，不与人来往
If you shut yourself off, you avoid seeing other people, usually because you are feeling depressed.

3. 切断，停止(…的供应)
If an official organization shuts off the supply of something, they no longer send it to the people they supplied in the past.

1. block off the passage through

e.g. We shut off the valve

Synonym: block offclose off

2. isolate or separate

e.g. She was shut off from the friends

Synonym: close off

3. stem the flow of

e.g. shut off the gas when you leave for a vacation

Synonym: close off