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square something up
to cause something to have right angles. Please square the door frames up better before you nail them in. Can you square up this box a little better?
square up (for fighting)
to get ready for an argument or a fight. John was angry and appeared to be squaring up for a fight. When those two square up, everyone gets out of the way.
Settle a bill or debt, as in The others went to get the car while he squared up with the waiter. This idiom derives from square in the sense of "set straight." [Early 1800s]
1. To make something conform to a desired plane, straight line, or right angle: He squared up the picture and nailed it in place. The golfer squared her feet up to the hole.
2. To make one's body, especially one's feet or shoulders, conform to a desired plane, straight line, or right angle: The football players squared up to the line of scrimmage. The basketball player squared up and shot a free throw.
3. square up to To come face to face with someone or something, especially with defiance or hostility; confront someone or something: The prisoners squared up to the guards and demanded better food.
4. To face one another in a competition: The two teams will square up tonight.
5. To settle some bill or debt: We went to the bar to square up our bill from the night before. The landlord demanded that I square up before the end of the month.