verb (used without object)
to pass, spend, or survive the winter: to overwinter on the Riviera.

1890–95; over- + winter; probably translation of Norwegian overvintre

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World English Dictionary
overwinter (ˌəʊvəˈwɪntə)
1.  (intr) to spend winter (in or at a particular place)
2.  (tr) to keep (animals or plants) alive through the winter
3.  (intr) (of an animal or plant) to remain alive throughout the winter

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Salmon are an energy-rich food source, vital to the overwinter survival and reproduction of bears.
Jim says bees die in cold climates regardless, leaving their eggs to overwinter.
Use dormant oils during winter to control insects that overwinter on deciduous
Adult bullfrogs overwinter in water to avoid freezing.
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