something that functions or operates underwater; specifically : a naval vessel designed to operate underwater
grinder
noun(grind-er)
a large sandwich on a long split roll with any of a variety of fillings (such as meatballs or cold cuts, cheese, lettuce, and tomato) —called also grinder, hero, hoagie, Italian sandwich, po'boy, sub, torpedo
grinder
noun(grind-er)
one that cranks a hand organ; especially : a street musician who operates a barrel organ