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linchpin
Definitions
[ˈlɪn(t)ʃpɪn], (Noun)
Definitions:
- a person or thing vital to an enterprise or organization
(e.g: nurses are the linchpin of the National Health Service)
- a pin passed through the end of an axle to keep a wheel in position
Phrases:
Origin
:
late Middle English: from Old English lynis (in the sense ‘linchpin’) + pin
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definition by Oxford Dictionaries