shut off1. To stop the flow or passage of; cut off: shut off the hot water by closing a valve.2. To close off; isolate: loners who shut themselves off from the community.3. To stop operating, especially automatically: The electricity shuts off at midnight.shut downTo cause to stop operatingshut off : 及物动词,切断(电源,水流等),还有隔离的意思 即切断外界联系,不及物,跟shut down类似 停止运作的对象做主语shut down 使。。停止运作 使动用法 如关闭电灯