1 (used about animals and birds) to travel from one part of the world to another at the same time every year （指动物及鸟类）迁徙，移栖

2 (used about a large number of people) to go and live and work in another place （指大批人）移居，移民，迁徙: Many country people were forced to migrate to the cities to look for work. 很多乡下人都被逼迁往城市找工作。 ☞ Look at emigrate. 参看emigrate。 ➔migration /maɪˈgreɪʃn ||; maɪˈgreʃən/ noun [C,U]