Definition from Wiktionary, the free dictionary
to ball up (phrasal verb)
- (transitive) To crush into a ball shape.
- She balled up her paper in frustration.
- (intransitive) to coil up into a ball.
- (intransitive) To hunch over and pull in one's arms and legs.
- Her son balls up in fear whenever there is a storm.
- (slang, transitive) to ruin or botch
(ruin or botch):
to crush into a ball
to hunch over and pull in one's limbs