Definition of overwinter verb from the Oxford Advanced American Dictionary

 

overwinter

 verb
verb
NAmE//ˌoʊvərˈwɪntər//
 
[intransitive, transitive]overwinter (something)Verb Forms present simple I / you / we / they overwinter
 
he / she / it overwinters
 
past simple overwintered
 
-ing form overwintering
 
 
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(of animals, birds, and plants) to spend the winter months in a place; to stay alive or to keep something alive during the winter compare winter
See the Oxford Advanced Learner's Dictionary entry: overwinter