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1751, in the meaning defined above
alteration (influenced by rumble entry 2) of obsolete English (northern dialect) rumgumption, probably from English rum entry 1 + gumption
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“Rumblegumption.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rumblegumption. Accessed 6 Jul. 2022.
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