lynch·pin
less common spelling of linchpin
1
: a locking pin inserted crosswise (as through the end of an axle or shaft)
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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“Lynchpin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lynchpin. Accessed 25 Jun. 2022.
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