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Related to settle up: settle down
settle up (with one)
To pay the balance of what is owed to someone. You get our jackets while I go settle up with the bartender. Brian and I need to settle up for those plane tickets soon—I hate having debt hanging over me.
Also, settle with someone. Pay a debt or one's share of the cost, as in When can you settle up for the tickets I bought for us? or Jean said she'd settle with the bank next month.
To balance an account by paying what is owed: After the poker game, we counted our chips and settled up. I went down to the racetrack and settled up with the bookie.