Definition of 'sub'

Noun

1. 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
      Synonyms: bomber grinder hero hero sandwich hoagie hoagy Cuban sandwich Italian sandwich poor boy submarine submarine sandwich torpedo wedge zep
2. a submersible warship usually armed with torpedoes
      Synonyms: submarine pigboat U-boat

Verb

1. 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"
      Synonyms: substitute stand in fill in

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