1. (noun) bomber, grinder, hero, hero sandwich, hoagie, hoagy, Cuban sandwich, Italian sandwich, poor boy, sub, submarine, submarine sandwich, torpedo, wedge, zep
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
2. (verb) submarine, pigboat, sub, U-boat
a submersible warship usually armed with torpedoes
3. (verb) substitute, sub, stand in, fill in
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"
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Definitions of sub 
