un accustom


verb (used with object)
to familiarize by custom or use; habituate: to accustom oneself to cold weather.

1425–75; late Middle English < Middle French acoustumer. See ac-, custom

preaccustom, verb (used with object)
reaccustom, verb (used with object)
unaccustom, verb (used with object)
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
accustom (əˈkʌstəm)
vb (usually foll by to)
to make (oneself) familiar (with) or used (to), as by practice, habit, or experience
[C15: from Old French acostumer, from costumecustom]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

early 15c., from M.Fr. acostumer, from à "to" + costume (see costume).
Online Etymology Dictionary, © 2010 Douglas Harper
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