Is it square up or squat up?

The phrase "square up" typically means to confront someone or prepare for a fight, while "squat up" is less common and may refer to gathering together for a specific purpose, often in a casual or social context. The correct usage depends on the situation. If you're referring to confrontation, "square up" is the appropriate choice; if it's about forming a group or team, you might use "squat up."