hold the fort
Meaning: If you hold the fort, you look after some operation, place or a business while the person who is normally in charge is away.
For example:
- Could you, please, hold the fort while I go to the Sheriff?
- You’ll be responsible for holding the fort every Friday when I am out of the office.
See more English idioms and quotes here: https://englishmafiaclub.com/category/english-practice