turn a profit

VERB
13 LETTERS · STARTS WITH T

turn a profit is a valid 13-letter word worth 16 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
T1U1R1N1A1P3R1O1F4I1T1
1 + 1 + 1 + 1 + 0 + 1 + 0 + 3 + 1 + 1 + 4 + 1 + 1 =16 PTS
DOUBLE WORD → 32TRIPLE WORD → 48
MEANING

What does turn a profit mean?