Etymology
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overwinter (v.)

"to pass the winter (in some place)," 1895, from over- + winter (v.). From 1933 as "to live through the winter;" transitive sense, in reference to animals, etc., "to keep alive over the winter" is by 1945. Related: Overwintered; overwintering. Old English had oferwintran "get through the winter."  

updated on November 10, 2019

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Definitions of overwinter from WordNet

overwinter (v.)
spend the winter;
Shackleton's men overwintered on Elephant Island
Synonyms: winter
From wordnet.princeton.edu, not affiliated with etymonline.