"migrate" in the verb sense
1. migrate, transmigrate
move from one country or region to another and settle there
"Many Germans migrated to South America in the mid-19th century"
"This tribe transmigrated many times over the centuries"
2. migrate
move periodically or seasonally
"birds migrate in the Winter"
"The workers migrate to where the crops need harvesting"
Source: WordNet® (An amazing lexical database of English)
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