closing machine

15 LETTERS · STARTS WITH C

closing machine is a valid 15-letter word worth 24 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3L1O1S1I1N1G2M3A1C3H4I1N1E1

3 + 1 + 1 + 1 + 1 + 1 + 2 + 0 + 3 + 1 + 3 + 4 + 1 + 1 + 1 =24 PTS

DOUBLE WORD → 48TRIPLE WORD → 72

MEANING

What does closing machine mean?