loose cannon

NOUN
12 LETTERS · STARTS WITH L

loose cannon is a valid 12-letter word worth 13 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
L1O1O1S1E1C3A1N1N1O1N1
1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 1 =13 PTS
DOUBLE WORD → 26TRIPLE WORD → 39
MEANING

What does loose cannon mean?

NOUN · 1 SENSE
1

A person who is expected to perform a particular task but who is out of control and dangerous.