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submarine (adj.)

1640s, from sub- + marine (adj.).

submarine (n.)

"submarine boat," 1899, from submarine (adj.). Earlier "a creature living under the sea" (1703). The short form sub is first recorded 1917. As a type of sandwich from 1955, so called from the shape of the roll. Related: Submariner.

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Definitions of submarine from WordNet
1
submarine (v.)
move forward or under in a sliding motion;
The child was injured when he submarined under the safety belt of the car
submarine (v.)
throw with an underhand motion;
submarine (v.)
bring down with a blow to the legs;
submarine (v.)
control a submarine;
submarine (v.)
attack by submarine;
The Germans submarined the Allies
2
submarine (n.)
a submersible warship usually armed with torpedoes;
Synonyms: pigboat / sub / U-boat
submarine (n.)
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;
Synonyms: bomber / grinder / hero / hero sandwich / hoagie / hoagy / Cuban sandwich / Italian sandwich / poor boy / sub / submarine sandwich / torpedo / wedge / zep
3
submarine (adj.)
beneath the surface of the sea;
Synonyms: undersea
From wordnet.princeton.edu