improve upon

12 LETTERS · STARTS WITH I

improve upon is a valid 12-letter word worth 20 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1M3P3R1O1V4E1U1P3O1N1

1 + 3 + 3 + 1 + 1 + 4 + 1 + 0 + 1 + 3 + 1 + 1 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does improve upon mean?