Meaning of the word "set in motion" in English

What does "set in motion" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

set in motion

US /sɛt ɪn ˈmoʊʃən/
UK /sɛt ɪn ˈməʊʃən/

Idiom

to start a process or activity

Example:
The new policy will set in motion a series of changes.
The discovery of oil set in motion a period of rapid economic growth.