submarine submarine /ˌsəbmɝˈiːn/

adjective

1. Beneath the surface of the sea  ( submarine , subsea , undersea )
   beneath the surface of the sea
    The precarious life of a submarine diver
   the precarious life of a submarine diver
    The precarious life of a subsea diver
   the precarious life of a subsea diver
    The precarious life of an undersea diver
   the precarious life of an undersea diver
   

noun

1. () A submersible warship usually armed with torpedoes  ( pigboat , sub [Informal] , U-boat , submarine )
   a submersible warship usually armed with torpedoes
    The USS Nautilus was the world's first operational nuclear-powered submarine
   The USS Nautilus was the world's first operational nuclear-powered submarine
   
   
2. [ N. American] 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  ( bomber [Informal, American] , Cuban sandwich [ N. American] , grinder [Informal, American] , hero , hero sandwich [ N. American] , hoagie [ N. American] , hoagy [ N. American] , Italian sandwich [ N. American] , poor boy [ N. American] , sub [Informal, N. American] , submarine [ N. American] , submarine sandwich [ N. American] , torpedo [American] , wedge [Informal, American] , zep [ N. American] )
   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
   
   

verb

1. Attack by submarine  ( submarine )
   attack by submarine
    The Germans submarined the Allies
   The Germans submarined the Allies
   
2. Control a submarine  ( submarine )
   control a submarine
   
3. (sport) bring down with a blow to the legs  ( submarine )
   (sport) bring down with a blow to the legs
   
4. (baseball) throw with an underhand motion  ( submarine )
   (baseball) throw with an underhand motion
   
5. Move forward or under in a sliding motion  ( submarine )
   move forward or under in a sliding motion
    The child was injured when he submarined under the safety belt of the car
   The child was injured when he submarined under the safety belt of the car