Meaning of the word mainspring in English

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

mainspring

US /ˈmeɪn.sprɪŋ/
UK /ˈmeɪn.sprɪŋ/

Noun

1.

the most important reason for something; the thing that makes something else happen:

Example:
Work was the mainspring of his life.
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