To fill up Meaning, Definition & Usage

Definitions
  1. to make quite full; to fill to the brim or entirely; to occupy completely; to complete. "The bliss that fills up all the mind." Pope. "And fill up that which is behind of the afflictions of Christ." Col. i. 24.
Definitions
  1. to grow or become quite full; as, the channel of the river fills up with sand.

Webster 1913