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

[ Syn: bomber , grinder , hero , hero sandwich , hoagie , hoagy , cuban sandwich , italian sandwich , poor boy , submarine , submarine sandwich , torpedo , wedge , zep ]

a submersible warship usually armed with torpedoes

[ Syn: submarine , pigboat , u-boat ]

be a substitute; The young teacher had to substitute for the sick colleague; The skim milk substitutes for cream--we are on a strict diet

[ Syn: substitute , stand in , fill in ]