expound

VERB /ɪk'spaʊnd/
7 LETTERS · 2 SYLLABLES · STARTS WITH E

expound is a valid 7-letter word worth 17 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
E1X8P3O1U1N1D2
1 + 8 + 3 + 1 + 1 + 1 + 2 =17 PTS
DOUBLE WORD → 34TRIPLE WORD → 51
MEANING

What does expound mean?