Rob Peter to pay Paul

Rob Peter to pay Paul

1. to borrow money from one person to pay back money you borrowed from someone else;
2. to harm one person in order to do good to another; or
3. to use money or resources set aside for one purpose for a different one.

Example:
A：I need to get some money off my credit card at the ATM.
B：What for?
A：I need to pay another credit card bill.
B：Do you think that's a good idea? Basically, you're robbing Peter to pay Paul.