square up

Short definition from Wiktionary

Verb

1. 1
   to get ready for a fight
2. 2
   to adopt a fighting stance
3. 3
   to face (someone) in a contest
4. 4
   to pay back money that is owed
5. 5
   To mill (blocks, inserts, etc) into precisely square condition.

Noun

1. 1
   A message shown before an exploitation film, indicating what social or moral issue the film attempts to address.