Definition of "Submarine" :

noun: a submersible warship usually armed with torpedoes

noun: 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

verb: attack by submarine

"The Germans submarined the Allies."

verb: control a submarine

verb: bring down with a blow to the legs

verb: throw with an underhand motion

verb: move forward or under in a sliding motion

"The child was injured when he submarined under the safety belt of the car."

adjective: beneath the surface of the sea