square up to someone—show courage in confronting a person:
- In the street was a group of lads obviously waiting for. I had little option but to square up to them.
square up with someone—
1. pay smb. the money one owes (leaving a restaurant, checking out of a hotel, etc.):
- Can I leave you to square up with the waiter?
2. retaliate upon a person:
- He wanted to “square up” with them, but had no definite plan of action, and was trusting to luck for something to turn up in his favor.