If you're in the Navy, a submarine is a military ship that goes under the water. If you're hungry, it's a type of sandwich.

This word mainly refers to a vessel that travels underwater and is armed with torpedoes — also known as a U-boat. But you can submarine someone by attacking them with a submarine or bringing them down with a blow to the legs. A disappointment can submarine — or sink — your hopes and dreams. In the kitchen, a submarine is what you call a long, crusty sandwich filled with meats and cheese — also known as a sub, grinder, hero, or hoagie.

Definitions of submarine
  1. noun
    a submersible warship usually armed with torpedoes
    synonyms: U-boat, pigboat, sub
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    attack submarine
    a military submarine designed and armed to attack enemy shipping
    auxiliary research submarine
    a submarine for research purposes
    fleet ballistic missile submarine
    a submarine carrying ballistic missiles
    nautilus, nuclear submarine, nuclear-powered submarine
    a submarine that is propelled by nuclear power
    type of:
    submersible, submersible warship
    a warship designed to operate under water
  2. 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
    synonyms: Cuban sandwich, Italian sandwich, bomber, grinder, hero, hero sandwich, hoagie, hoagy, poor boy, sub, submarine sandwich, torpedo, wedge, zep
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    type of:
    two (or more) slices of bread with a filling between them
  3. adjective
    beneath the surface of the sea
    synonyms: undersea
    beneath the surface
  4. verb
    attack by submarine
    “The Germans submarined the Allies”
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    type of:
    assail, attack
    launch an attack or assault on; begin hostilities or start warfare with
  5. verb
    control a submarine
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    type of:
    control, operate
    handle and cause to function
  6. verb
    move forward or under in a sliding motion
    “The child was injured when he submarined under the safety belt of the car”
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    type of:
    skid, slew, slide, slip, slue
    move obliquely or sideways, usually in an uncontrolled manner
  7. verb
    bring down with a blow to the legs
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    type of:
    cut down, down, knock down, pull down, push down
    cause to come or go down
  8. verb
    throw with an underhand motion
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    type of:
    flip, pitch, sky, toss
    throw or toss with a light motion
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