Meaning of submarine
Definition of submarine
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)
move forward or under in a sliding motion; "The child was injured when he submarined under the safety belt of the car"
attack by submarine; "The Germans submarined the Allies"