名詞 sub-:

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

動詞 sub-:

1. be a substitute
   同義詞：substitute, sub, stand in, fill in