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Noun: loose cannon
  1. A person who is expected to perform a particular task but who is out of control and dangerous

Derived forms: loose cannons

Type of: individual, mortal, person, somebody, someone, soul

Encyclopedia: Loose cannon

Nearest

loop knot
loop topology
looper
loophole
looping
loop-line
loop-the-loop
loopy
Loos
loose
loose cannon
loose end
loose off
loose sentence
loose smut
loose woman
loose-fitting
loose-jointed
loose-jowled
looseleaf
loose-leaf lettuce