sub

PRIMARY MEANINGS OF: sub

1
n
a submersible warship usually armed with torpedoes
2
v
be a substitute
FULL DEFINITIONS OF: sub
1

n a submersible warship usually armed with torpedoes

Synonyms:
U-boat, pigboat, submarine
Types:
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attack submarine
a military submarine designed and armed to attack enemy shipping
auxiliary research submarine
a submarine for research purposes
fleet ballistic missile submarine
a submarine carrying ballistic missiles
nautilus, nuclear submarine, nuclear-powered submarine
a submarine that is propelled by nuclear power
Type of:
submersible, submersible warship
a warship designed to operate under water

n 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

Synonyms:
Cuban sandwich, Italian sandwich, bomber, grinder, hero, hero sandwich, hoagie, hoagy, poor boy, submarine, submarine sandwich, torpedo, wedge, zep
Type of:
sandwich
two (or more) slices of bread with a filling between them
2

v be a substitute

Synonyms:
fill in, stand in, substitute
Type of:
change, exchange, interchange
give to, and receive from, one another
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