verb be a substitute.
— synonyms: substitute, stand_in, fill_in
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).
— synonyms: bomber, grinder, hero, hero_sandwich, hoagie, hoagy, Cuban_sandwich, Italian_sandwich
noun a submersible warship usually armed with torpedoes.
— synonyms: submarine, pigboat, U-boat