What does "unball" mean?

To release (the fists, etc.) from a balled shape.

Unball

verb

verb ·Rare ·Advanced level

Verb

1
To release (the fists, etc.) from a balled shape. transitive
2
To recover one's original shape from a balled stance. intransitive
"And just like he unballed, my multilingual hedgehog pal balls right back up into the safety of his disguise."

"And just like he unballed, my multilingual hedgehog pal balls right back up into the safety of his disguise."

From un- + ball.