I. ˈsəb-mə-ˌrēn, ˌsəb-mə-ˈ adjective
Date: 1648
: underwater ; especially : undersea
submarine plants
submarine minerals
II. noun
Date: 1703
1. : something that functions or operates underwater ; specifically : a naval vessel designed to operate underwater
2. : a large sandwich on a long split roll with any of a variety of fillings (as meatballs or cold cuts, cheese, lettuce, and tomato) — called also grinder, hero, hoagie, Italian sandwich, po'boy, sub, torpedo
III. verb
( -rined ; -rin·ing )
Date: 1914
transitive verb
: to attack by or as if by a submarine : attack from beneath
intransitive verb
: to dive or slide under something