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sub

/sʌb/ noun

noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about sub at Wordnik → Where our words come from →

  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.
  2. A submersible warship usually armed with torpedoes.

verb

  1. Be a substitute.
    The young teacher had to substitute for the sick colleague

Origin

* Shortened form of any of various words beginning with sub-.

From Wiktionary, via Kaikki.org (CC BY-SA)