verb (used with object), winterized, winterizing.
to prepare (an automobile, house, etc.) for cold weather by (in automobiles) adding antifreeze and changing oil or (in houses) adding insulation, heating units, etc.
verb (used without object), winterized, winterizing.
to winterize an automobile, house, etc.
Also, especially British, winterise.

1925–30; winter + -ize

winterization, noun
winterizer, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
winterize or winterise (ˈwɪntəˌraɪz)
(US), (Canadian) (tr) to prepare (a house, car, etc) to withstand winter conditions
winterise or winterise
winteri'zation or winterise
winteri'sation or winterise

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Drivers are encouraged to follow these tips to winterize vehicles:.
The following information gives specific tips to winterize your vessel in an
  environmentally sensitive manner.
Winterize your vehicle now, before winter weather threatens.
Here are a few items that you should pay special attention to as you winterize
  your vehicle.
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