shape up

Short definition from Wiktionary

Verb

1. 1
   To improve; to correct one's bad habits or behavior.
2. 2
   To take shape; to transform into or become.
3. 3
   To gesture or posture threateningly; to approach as if to fight; to pose to intimidate.

Noun

1. 1
   Alternative form of shapeup (any sense): Gathering of workers to be picked for a job.
2. 2
   Alternative form of shapeup (any sense): Activity to get someone or something back into shape.
3. 3
   Alternative form of shapeup (any sense): Hairstyle