lynchpin

noun
lynch·​pin

less common spelling of

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 20 Feb. 2020.

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Nglish: Translation of lynchpin for Spanish Speakers

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