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sub
noun(sub)
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, cuban sandwich, grinder, hero, hero sandwich, hoagie, hoagy, italian sandwich, poor boy, submarine, submarine sandwich, torpedo, wedge, zep,
sub
verb(sub)
be a substitute
Synonyms: fill in, stand in, substitute,
Examples:
The young teacher had to substitute for the sick colleague.
The skim milk substitutes for cream--we are on a strict diet.
sub
noun(sub)
a submersible warship usually armed with torpedoes
Synonyms: pigboat, submarine, u-boat,

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