1. (

• bomber ,
• grinder ,
• hero ,
• hero_sandwich ,
• hoagie ,
• hoagy ,
• Cuban_sandwich ,
• Italian_sandwich ,
• poor_boy ,
• sub ,
• submarine ,
• submarine_sandwich ,
• torpedo ,
• wedge ,
• zep

) 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 ;

2. (

• submarine ,
• pigboat ,
• sub ,
• U-boat

) a submersible warship usually armed with torpedoes ;

1. (

• substitute ,
• sub ,
• stand_in ,
• fill_in

) be a substitute; "The young teacher had to substitute for the sick colleague"; "The skim milk substitutes for cream;