linchpin


Concise Oxford English Dictionary © 2008 Oxford University Press:
linchpin /ˈlɪntʃpɪn/ (also lynchpin)
noun
  • 1 a pin through the end of an axle keeping a wheel in position.
  • 2 an indispensable person or thing.
– origin ME: from OE lynis (in the sense ‘linchpin’) + pin.
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