Being, acting, or growing, under water in the sea; as, submarine navigators; submarine plants.
- Nautical A vessel that is capable of operating submerged. Also called sub1.
- A large sandwich consisting of a long roll split lengthwise and filled with layers of meat, cheese, tomatoes, lettuce, and condiments. Also called sub1; also called regionally Cuban sandwich, grinder, hero, hoagie, Italian sandwich, poor boy, torpedo, wedge, zep.
- Beneath the surface of the water; undersea.
- To attack by submarine, especially with torpedoes.
- Sports To knock down with a blow to the legs.
- Baseball To pitch (a ball) with an underhand motion.
- To slide, drive, or throw under something.