definition of
submarine

[1] #1 submarine n. [pigboat, sub, U-boat] a submersible warship usually armed with torpedoes. wn

[2] #2 submarine v. move forward or under in a sliding motion; "The child was injured when he submarined under the safety belt of the car". wn

[3] #3 submarine s. [undersea] beneath the surface of the sea. wn

[4] #4 submarine n. [bomber, grinder, hero, hero sandwich, hoagie, hoagy, Cuban sandwich, Italian sandwich, poor boy, sub, submarine sandwich, torpedo, wedge, zep] 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. wn

[5] #5 submarine v. throw with an underhand motion. wn