punch up

Short definition from Wiktionary

Verb

1. 1
   To beat (someone) up by punching, to fist-fight.
2. 2
   To attack, counterattack, or target a group of greater power or status than oneself.
3. 3
   To make bolder, zestier, or more exciting.
4. 4
   To switch (a source) into the main transmission.
5. 5
   Misspelling of punch up.

Noun

1. 1
   Misspelling of punch-up.
2. 2
   A fight with the fists.