use up

VERB
6 LETTERS · STARTS WITH U

use up is a valid 6-letter word worth 7 points in Scrabble and 10 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
U1S1E1U1P3
1 + 1 + 1 + 0 + 1 + 3 =7 PTS
DOUBLE WORD → 14TRIPLE WORD → 21
MEANING

What does use up mean?