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noun Law.
  1. abuse of a right; unlawful use of an office, franchise, benefit, etc.
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Origin of misuser1

1615–25; noun use of Middle French mesuser to misuse


  1. a person who misuses.
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Origin of misuser2

First recorded in 1540–50; mis-1 + user1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for misuser


  1. law an abuse of some right, privilege, office, etc, such as one that may lead to its forfeiture
  2. (often in combination) a person who regularly abuses alcohol, drugs, etcheroin misusers
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Word Origin

C17: from Old French mesuser (infinitive used as noun)
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