descending

ADJECTIVE
10 LETTERS · STARTS WITH D

descending is a valid 10-letter word worth 15 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
D2E1S1C3E1N1D2I1N1G2
2 + 1 + 1 + 3 + 1 + 1 + 2 + 1 + 1 + 2 =15 PTS
DOUBLE WORD → 30TRIPLE WORD → 45
MEANING

What does descending mean?