square up verb 5square-up noun 1forms 4 verb5 •To get ready for a fight. •To adopt a fighting stance.Samir Nasri was shown a second yellow card moments earlier after squaring up to Jamie Vardy, with the two players going forehead to forehead after exchanging insults. — 2017 •To pay back money that is owed.Let me know how much my share in the activity is and I'll square up with you tomorrow. •To face (someone) in a contest. •To mill (blocks, inserts, etc) into precisely square condition. square-up noun1 •A message shown before an exploitation film, indicating what social or moral issue the film attempts to address. formssquared up · squaring up · squares up · square-ups