Definition of punch ups:
(v) :
(transitive) To make bolder, zestier, or more exciting.
(v) :
(transitive) To beat (someone) up by punching, to fist-fight.
(v) :
(intransitive, slang) To attack, counterattack, or target a group of greater power or status than oneself.
(v) :
(transitive, television) To switch (a source) into the main transmission.
(n) :
Misspelling of punch-up. [(informal) A fight with the fists.]