submarine

American  

[suhb-muh-reen, suhb-muh-reen, suhb-muh-reen] / ˌsʌb məˈrin, ˈsʌb məˌrin, ˌsʌb məˈrin /

noun

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.

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adjective

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)

submarined, submarining

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)

submarined, submarining

1. to attack or sink by submarine.

submarine British  

/ ˈsʌbməˌriːn, ˌsʌbməˈriːn /

noun

1. Often shortened to: sub.  a vessel, esp one designed for warfare, capable of operating for protracted periods below the surface of the sea

2. (modifier)

   1. of or relating to a submarine

      a submarine captain

   2. occurring or situated below the surface of the sea

      a submarine cable

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Regionalisms

See hero sandwich.

Other Word Forms

• antisubmarine adjective

Etymology

Origin of submarine

1640–50; 1895–1900 submarine for def. 1; sub- + marine

Example Sentences

The other two are in Sardinia, and are earmarked for closure in 2028-2029, once the island is electrically linked to the mainland via a new submarine cable.

From Barron's • Mar. 31, 2026

Just the year before, in February 1942, a Japanese submarine had shelled an oil field near Santa Barbara, and the very next night, L.A. was ordered into a blackout.

From Los Angeles Times • Mar. 26, 2026

The military earlier said it eliminated an Iranian Kilo-class submarine, which was also thought to have the capability to launch mines.

From The Wall Street Journal • Mar. 12, 2026

The Iranian warship Iris Dena was given permission by India to dock three days before it was torpedoed by a US submarine, India has said.

From BBC • Mar. 9, 2026

Alex thought back to the submarine and the vacuum-sealed boxes.

From "Stormbreaker" by Anthony Horowitz

Related Words

• sub
• torpedo