expansion coupling

18 LETTERS · STARTS WITH E

expansion coupling is a valid 18-letter word worth 31 points in Scrabble and 40 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

E1X8P3A1N1S1I1O1N1C3O1U1P3L1I1N1G2

1 + 8 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 3 + 1 + 1 + 1 + 2 =31 PTS

DOUBLE WORD → 62TRIPLE WORD → 93

MEANING

What does expansion coupling mean?