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fast pin

noun
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Definition of fast pin

: a pin, screw, or nail or something resembling one of these that fastens securely or immovably specifically : the nonremovable rod that holds together the flaps on a fast-joint hinge

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“Fast pin.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/fast%20pin. Accessed 18 January 2020.

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