Noun
-
a submersible warship usually armed with torpedoes
- u boat -
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
- hero sandwich - cuban sandwich - italian sandwich - poor boy - submarine sandwich
Verb
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be a substitute
"The young teacher had to substitute for the sick colleague"
"The skim milk substitutes for cream--we are on a strict diet"
- stand in - fill in