1. a vessel that can be submerged and navigated under water, usually built for warfare and armed with torpedoes or guided missiles.
  2. something situated or living under the surface of the sea, as a plant or animal.
  3. Chiefly Northeastern and North Midland U.S. a hero sandwich.


  1. situated, occurring, operating, or living under the surface of the sea: a submarine mountain.
  2. of, relating to, or carried on by a submarine or submarines: submarine warfare.

verb (used without object), sub·ma·rined, sub·ma·rin·ing.

  1. to participate in the operating of a submarine.
  2. to move or slide under something.
  3. Slang.
    1. to be thrown under the steering wheel of the vehicle one is driving during a frontal crash.
    2. to be thrown out of one’s seat belt in such a crash.

verb (used with object), sub·ma·rined, sub·ma·rin·ing.

  1. to attack or sink by submarine.


  1. (of weapons, missiles, etc) designed to combat or destroy submarines
  2. (of warfare, tactics, etc) against submarines


  1. a vessel, esp one designed for warfare, capable of operating for protracted periods below the surface of the seaOften shortened to: sub
  2. (modifier)
    1. of or relating to a submarinea submarine captain
    2. occurring or situated below the surface of the seaa submarine cable

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


“submarine boat,” 1899, from submarine (adj.). The short form sub is first recorded 1917. Submarine sandwich (1955) so called from the shape of the roll.

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