lynchpin

noun lynch·pin \ˈlinch-ˌpin\

variant of

  1. 1 :  a locking pin inserted crosswise (as through the end of an axle or shaft)

  2. 2 :  one that serves to hold together parts or elements that exist or function as a unit <the linchpin in the defense's case>


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to trick or confuse (someone)

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