machine rifle

NOUN /mə'ʃin_'raɪfəl/
13 LETTERS · STARTS WITH M

machine rifle is a valid 13-letter word worth 22 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3A1C3H4I1N1E1R1I1F4L1E1
3 + 1 + 3 + 4 + 1 + 1 + 1 + 0 + 1 + 1 + 4 + 1 + 1 =22 PTS
DOUBLE WORD → 44TRIPLE WORD → 66
MEANING

What does machine rifle mean?