Definition of "shape up" in English

Verb

1. To improve; to correct one's bad habits or behavior.

   • He'd better shape up soon, or he'll fail the class.

2. To take shape; to transform into or become.

   • The fog has vanished and it's shaping up to be a beautiful day.

3. To gesture or posture threateningly; to approach as if to fight; to pose to intimidate.