Princeton's WordNet

1. bomber, grinder, hero, hero sandwich, hoagie, hoagy, Cuban sandwich, Italian sandwich, poor boy, sub, submarine, submarine sandwich, torpedo, wedge, zep(noun)

   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. submarine, pigboat, sub, U-boat(verb)

   a submersible warship usually armed with torpedoes

3. substitute, sub, stand in, fill in(verb)

   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"

Kernerman English Learner's Dictionary

1. sub(noun)ʌb

   a submarine

2. subʌb

   a sandwich made with a long narrow roll

   a turkey sub

3. subʌb

   a substitute who does a person's job when they are away

   We had a sub in my history class today.

Webster Dictionary

1. Sub(noun)

   a subordinate; a subaltern

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