Shape Up Meaning

(intransitive, idiomatic) To take shape; to transform into or become.

Example:   He'd better shape up soon, or he'll fail the class.
  The fog has vanished and it's shaping up to be a beautiful day.
1983, The Right Stuff, 02:04:00
  -- "Pretty good. A full refrigerator! I can see this afternoon is shaping up just great."