Punch up
Definition 1 of 2
Pro Tip 1/3Verb Nuance
Used figuratively to mean a conflict, not always physical. 
The debate turned into quite the punch up.
Pro Tip 2/3Colloquial Usage
More common in casual conversation than in formal settings. 
Avoid using 'punch up' in formal essays.
Pro Tip 3/3Cultural Colloquialism
Familiar to UK, Australia, and NZ speakers; might confuse others. 
He didn't understand when I said 'punch up'.