(~s, migrating, ~d)
1.
If people ~, they move from one place to another, especially in order to find work or to live somewhere for a short time.
People ~ to cities like Jakarta in search of work...
Farmers have learned that they have to ~ if they want to survive.
VERB: V prep/adv, V
migration (migrations)
...the migration of Soviet Jews to Israel.
N-VAR
2.
When birds, fish, or animals ~, they move at a particular season from one part of the world or from one part of a country to another, usually in order to breed or to find new feeding grounds.
Most birds have to fly long distances to ~.
...a dam system that kills the fish as they ~ from streams to the ocean.
VERB: V, V prep/adv
migration
...the migration of animals in the Serengeti.
N-VAR