Usually means: Substitute, often in sports, teaching.
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We found 56 dictionaries that define the word sub:

General (27 matching dictionaries)
  1. sub, sub-: Merriam-Webster.com
  2. sub, sub, sub-: Oxford Learner's Dictionaries
  3. sub, sub, sub, sub-: American Heritage Dictionary of the English Language
  4. sub, sub, sub-: Collins English Dictionary
  5. sub: Vocabulary.com
  6. Sub, sub, sub-: Wordnik
  7. sub, sub-: Cambridge Advanced Learner's Dictionary
  8. sub, sub-: Wiktionary
  9. sub, sub-: Webster's New World College Dictionary, 4th Ed.
  10. sub, sub-: The Wordsmyth English Dictionary-Thesaurus
  11. sub: Infoplease Dictionary
  12. sub, sub, sub-: Dictionary.com
  13. sub-: Online Etymology Dictionary
  14. sub: Cambridge Essential American English Dictionary
  15. Sub (TV channel), Sub (album), Sub, The Sub, .sub: Wikipedia, the Free Encyclopedia
  16. Sub-, Sub: Online Plain Text English Dictionary
  17. sub, sub-: Webster's Revised Unabridged, 1913 Edition
  18. Sub: Rhymezone
  19. Sub-, Sub: AllWords.com Multi-Lingual Dictionary
  20. sub: Webster's 1828 Dictionary
  21. sub, sub-: MyWord.info
  22. sub: Stammtisch Beau Fleuve Acronyms
  23. sub, sub-: Free Dictionary
  24. sub: Mnemonic Dictionary
  25. sub, sub, sub, sub-: Dictionary/thesaurus

Art (3 matching dictionaries)
  1. Anime Glossary (No longer online)
  2. sub-: A Cross Reference of Latin and Greek Elements
  3. ODLIS: Online Dictionary of Library and Information Science (No longer online)

Business (1 matching dictionary)
  1. Glossary of Legal Terms (No longer online)

Computing (3 matching dictionaries)
  1. SUB: Free On-line Dictionary of Computing
  2. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  3. sub: Encyclopedia

Medicine (8 matching dictionaries)
  1. Sub-: MedTerms.com Medical Dictionary
  2. ABTA Brain Tumor Patients (No longer online)
  3. Sub-: MedFriendly Glossary
  4. online medical dictionary (No longer online)
  5. Neurotrauma Glossary (No longer online)
  6. Glossary of HIV/AIDS Related Terms (No longer online)
  7. sub, sub-: Medical dictionary
  8. Sub-: Drug Medical Dictionary

Miscellaneous (4 matching dictionaries)
  1. SUB-, SuB: Acronym Finder
  2. SUB: Three Letter Words with definitions
  3. AbbreviationZ (No longer online)
  4. sub: Idioms

Science (4 matching dictionaries)
  1. sub: Dictionary of Botanical Epithets
  2. Botanical Terms (No longer online)
  3. Flora of New South Wales (No longer online)
  4. Glossary of Roots of Botanical Names (No longer online)

Slang (2 matching dictionaries)
  1. sub, sub, sub, sub, sub, sub: Green’s Dictionary of Slang
  2. S.U.B, The Sub: Urban Dictionary

Tech (4 matching dictionaries)
  1. sub: Webster's New World Telecom Dictionary
  2. Schlumberger Oilfield Glossary (No longer online)
  3. SeaTalk Dictionary of English Nautical Language (No longer online)
  4. Sweetwater Music (No longer online)

(Note: See subbed as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
verb:  (US, informal) To substitute for.
verb:  (US, informal) To work as a substitute teacher, especially in primary and secondary education.
verb:  (British, informal, soccer) To replace (a player) with a substitute.
verb:  (British, informal, soccer, less common, often as "sub on") To bring on (a player) as a substitute.
verb:  (British) To perform the work of a subeditor or copy editor; to subedit.
verb:  (slang, Internet, transitive) To subtitle (usually a film or television program).
verb:  (UK, slang, transitive) To lend (a person) money.
verb:  (slang, intransitive) To subscribe.
verb:  (BDSM) To take a submissive role.
verb:  To coat with a layer of adhering material; to planarize by means of such a coating.
verb:  (microscopy) To prepare (a slide) with a layer of transparent substance to support and/or fix the sample.
noun:  Abbreviation of submarine. [(nautical) A boat that can go underwater.]
noun:  Short for submarine sandwich.: a sandwich made on a long bun. [(US, Canada) A sandwich made on a long, cylindrical roll split lengthwise.]
noun:  (nautical) Clipping of submersible. [(British) A small nonmilitary, non-nuclear submarine for exploration.]
noun:  (informal) Clipping of substitute, often in sports or teaching. [A replacement or stand-in for something that achieves a similar result or purpose.]
noun:  (British, informal, often in plural) Clipping of subscription (a payment made for membership of a club, etc.) [Access to a resource for a period of time, generally for payment.]
noun:  (Internet, informal) Clipping of subtitle. [(authorship) A heading below or after a title.]
noun:  (computing, programming) Clipping of subroutine. (sometimes one that does not return a value, as distinguished from a function, which does) [(computer science) A section of code, called by the main body of a program, that implements a task.]
noun:  (colloquial) Clipping of subeditor. [An assistant editor, usually in a specific department of a newspaper.]
noun:  (colloquial) Clipping of subcontractor. [A contractor hired by a general contractor employed by the contractor rather than directly hired by the customer.]
noun:  (slang) Clipping of subwoofer. [A loudspeaker designed to produce low-frequency sound, especially subbass.]
noun:  (publishing, colloquial) Clipping of submission (of a work for publication) [The act of submitting or yielding; surrender.]
noun:  (BDSM, informal) Clipping of submissive. [(BDSM) One who submits to a dominating partner in BDSM practices.]
noun:  (colloquial, dated) Clipping of subordinate. [(countable) One who is subordinate.]
noun:  (colloquial, dated) Clipping of subaltern. [A subordinate.]
noun:  (colloquial, Internet) Clipping of subscription (or (by extension) a subscriber) to an online channel or feed. [Access to a resource for a period of time, generally for payment.]
noun:  (colloquial) Short for subsistence money (part of a worker's wages paid before the work is finished)
noun:  (Internet slang) Short for subreddit. [(Internet) Any of the subforums, generally intended for discussion of a specific topic, on the Reddit web site.]
noun:  (Philippines, colloquial) Clipping of subject (“particular area of study”). [(grammar) The noun, pronoun or noun phrase about whom the statement is made. In active clauses with verbs denoting an action, the subject is the actor. In clauses in the passive voice the subject is the target of the action.]

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