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submarine (adj.)

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

submarine (n.)

"submarine boat," 1899, from submarine (adj.), perhaps short for earlier submarine vessel (1732), etc. Earlier "a creature living under the sea" (1703). The short form sub is attested from 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