Torpedo Very Common

a professional killer who uses a gun

"The hitman tried to hide his identity, but everyone in the city knew he was just another torpedo looking for a target."

a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States

"After a long hike, we stopped at the deli where I ordered a massive submarine sandwich loaded with turkey, ham, swiss cheese, and all the fresh vegetables."

an explosive device that is set off in an oil well (or a gas well) to start or to increase the flow of oil (or gas)

"After weeks of low production, the drilling crew decided to fire a torpedo into the exhausted well to boost the output."

a small firework that consists of a percussion cap and some gravel wrapped in paper; explodes when thrown forcefully against a hard surface

"The kids spent their allowance buying cheap torpedoes to toss at the brick wall during the Fourth of July celebration."

a small explosive device that is placed on a railroad track and fires when a train runs over it; the sound of the explosion warns the engineer of danger ahead

"The sudden boom sounded like a torpedo going off just as the locomotive approached the broken bridge."

armament consisting of a long cylindrical self-propelled underwater projectile that detonates on contact with a target

"The submarine launched a torpedo to sink the enemy destroyer before it could return fire."

any sluggish bottom-dwelling ray of the order Torpediniformes having a rounded body and electric organs on each side of the head capable of emitting strong electric discharges

"The biologist carefully avoided stepping near the hidden torpedo resting in the sandy ocean floor, knowing its electric shock could be dangerous."

An electric ray of the genus Torpedo.

"The diver was startled when a torpedo bumped against his leg while swimming near the reef."