level best

NOUN
10 LETTERS · STARTS WITH L

level best is a valid 10-letter word worth 14 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
L1E1V4E1L1B3E1S1T1
1 + 1 + 4 + 1 + 1 + 0 + 3 + 1 + 1 + 1 =14 PTS
DOUBLE WORD → 28TRIPLE WORD → 42
MEANING

What does level best mean?

NOUN · 1 SENSE
1

The greatest possible degree.