sub-

名词 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
   同义词：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
   同义词：submarine, pigboat, sub, U-boat

动词 sub-:

1. be a substitute
   同义词：substitute, sub, stand in, fill in