Definition
To temporarily take charge of a situation or place while the person who usually does so is away.
在某人不在时，暂时负责某事。
The manager is out today, so I have to hold down the fort at the office.
经理今天不在，所以我得在办公室留守。
I have to work late tonight, can you hold down the fort with the kids?
我今晚得加班，你能帮忙照顾一下孩子吗？
While the supervisor was at the conference, the assistant held down the fort in the office.
主管去参加会议时，助理在办公室留守。