Definition of "sub"
noun:
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A submarine.
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A submarine sandwich—a sandwich made on a long bun.
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A substitute.
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A substitute in a football (soccer) game: someone who comes on in place of another player part way through the game.
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Short for subscription: a payment made for membership of a club, etc.
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A submissive in BDSM practices.
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Short for subtitle.
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A subroutine (sometimes one that does not return a value, as distinguished from a function, which does).
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A subordinate.
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A subaltern.
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verb:
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To substitute for.
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To work as a substitute teacher, especially in primary and secondary education.
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(soccer) To replace (a player) with a substitute.
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(soccer) Less commonly, and often as sub on, to bring on (a player) as a substitute.
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To perform the work of a subeditor or copy editor; to subedit.
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To lend.
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To subscribe.
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To coat with a layer of adhering material; to planarize by means of such a coating.
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To prepare (a slide) with an layer of transparent substance to support and/or fix the sample.
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preposition: