Definition of snowbird noun from the Oxford Advanced Learner's Dictionary

 

snowbird

 noun
noun
BrE BrE//ˈsnəʊbɜːd//
 
; NAmE NAmE//ˈsnoʊbɜːrd//
 
(North American English, informal)
 
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a person who spends the winter in a warmer climate, especially an old person from the north of the US, or from Canada, who spends the winter in the south
See the Oxford Advanced American Dictionary entry: snowbird