submarine
n. · adj. · v.-
1 underwater vessel (n.) A2 Elementarya ship that can travel deep under the ocean for a long time.
a naval vessel capable of independent operation underwater, typically used for military or research purposes.
ExampleThe submarine stayed under the water for three months without coming up.
ExampleModern nuclear submarines are capable of remaining submerged for months at a time, limited only by the food supplies required for the crew.
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2 a long sandwich (n.) B1 Intermediate American English Informal Cookinga long bread roll filled with meat, cheese, and vegetables.
a large sandwich consisting of a long crusty roll split lengthwise and filled with various meats and cheeses.
ExampleI ordered a turkey submarine with extra pickles for lunch.
ExampleThe local deli is famous for its massive submarines, which are packed with imported Italian meats and a signature vinaigrette.
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3 underwater (adj.) B2 Upper Intermediate Sciencehappening or existing beneath the surface of the sea.
existing, occurring, or used under the surface of the sea.
ExampleScientists are studying submarine volcanoes to see how they change the ocean floor.
ExampleThe company specialises in the maintenance of submarine cables that provide high-speed internet across the Atlantic.
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4 to slide under (v.) C1 Advanced Technical Technicalto slide forward and under something, like a seatbelt during a car crash.
to slide forward underneath a restraint, such as a lap belt, during a sudden deceleration or collision.
ExampleThe crash test dummy started to submarine because the seatbelt was too loose.
ExampleEngineers redesigned the seat base to prevent passengers from submarining during a high-impact frontal collision.
UsageThe verb is intransitive in this safety-testing context.
From sub- + marine.