1 [mis-yoo-zer]
noun Law.
abuse of a right; unlawful use of an office, franchise, benefit, etc.

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

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2 [mis-yoo-zer]
a person who misuses.

1540–50; mis-1 + user

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
misuser (ˌmɪsˈjuːzə)
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, etc: heroin misusers
[C17: from Old French mesuser (infinitive used as noun)]

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Example sentences
Responsibility for the outcome of known, intentional misuse rests squarely on the misuser.
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