Meaning of the word linchpin in English

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

linchpin

US /ˈlɪntʃ.pɪn/
UK /ˈlɪntʃ.pɪn/

Noun

1.

a person or thing vital to an enterprise or organization

Example:
She was the linchpin of the entire project, coordinating all the different teams.
The new software proved to be the linchpin for the company's success.
2.

a pin passed through the end of an axle to keep a wheel in position

Example:
He checked the linchpin on the wagon wheel to ensure it was secure.
Without the linchpin, the wheel would come off the axle.