square up
US /skwer ʌp/
UK /skwer ʌp/

1.
to prepare for a fight or confrontation
:
•
The two boxers squared up in the middle of the ring.
•
He squared up to his opponent, ready for anything.
2.
to pay a debt or settle an account
:
•
It's time to square up with the landlord for this month's rent.
•
Let's square up our expenses from the trip.