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one-off

Chiefly British
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adjective
  1. done, occurring, or made only once; one-shot.
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noun
  1. something occurring, done, or made only once.
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Origin of one-off

First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for one-off

one-off

noun
  1. British
    1. something that is carried out or made only once
    2. (as modifier)a one-off job
    Also: one-shot
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Word Origin

See off (sense 15)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for one-off

n.

"single example of a manufactured product," 1934, from one + off. Later given figurative extension.

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Online Etymology Dictionary, © 2010 Douglas Harper