ball up

Short definition from Wiktionary

Verb

1. 1
   To crush or form into a ball shape.
2. 2
   To crush or form into a ball shape: To form melted metals into balls or lumps to roll them out of a furnace for further use.
3. 3
   To coil up into a ball.
4. 4
   To become ball-shaped.
5. 5
   To hunch over and pull in one's arms and legs.
6. 6
   To ruin or botch.
7. 7
   To smoke marijuana.
8. 8
   To play basketball, especially playing well.
9. 9
   To switch to using a stronger bowling ball.
10. 10
    To become covered in damp snow.
11. 11
    To produce a lip of debris around the drill hole.
12. 12
    To become confused or discombobulated; to confuse (someone).

Noun

1. 1
   The method by which the field umpire restarts play at a neutral contest after a stoppage within the field of play, involving the throwing or bouncing of the ball up between two players, known as rucks, who then attempt to win possession for their teams.