
A square-up was a common feature of exploitation films in the 1940s and 1950s. With the exception of most burlesque features during the 1950s, the films would begin with a written message about what social or moral issue the film was planning to address. For instance, She Shoulda Said No! contained a square-up concerning youth drug abuse, and Chil...
Found on
http://en.wikipedia.org/wiki/Square-up

Prepare to fight (as in boxing).
Found on
http://www.faqs.org/faqs/australian-faq/part5/

[
v] - even up the edges of a stack of paper, in printing
Found on
http://www.webdictionary.co.uk/definition.php?query=square%20up

Prepare to fight (as in boxing)
Found on
https://mudcat.org/aussie/display_all.cfm

Defensive stance that includes bent knees, feet that are shoulder width apart, etc.
Found on
https://winninghoops.com/glossary-of-basketball-terms/

When a player catches the basketball on the perimeter, they 'square up' to the hoop by turning so that their feet, hips, and shoulders are aligned. This puts them in the position to shoot, pass, or dribble at any moment.
Found on
https://www.basketballforcoaches.com/basketball-terms/
No exact match found.