1. past tense of ball; formed into a ball shape
2. past tense of ball; became tangled or matted together

Examples

• She balled up the paper and threw it away.
• The yarn balled in her hands as she worked.
• He balled his fists in anger.
• The wet leaves balled together on the ground.
• The dough balled when she kneaded it too much.
• Her hair balled up after sleeping on it wrong.