loose cannon
A cannon that breaks loose from its moorings on a ship during battle or storm, with the potential to cause serious damage to the ship and her crew.
ADJ
water
The fire department aimed their water cannon at the burning building to control the flames.
VERB + CANNON
load | aim | fire, shoot
CANNON + VERB
boom, roar, thunder
The old cannons roared loudly during the historical battle reenactment last weekend.
fire (sth)
The soldiers loaded the cannon and prepared to fire it across the harbor.
CANNON + NOUN
ball, shell | fire, shot | crew
fodder
Young soldiers were treated as cannon fodder during the brutal battle.