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Cousin Jack

Cousin Jack was a affectionate but sometimes patronizing nickname for a Cornishman, widely used during the 19th and early 20th centuries when Cornish miners emigrated in large numbers to work in mines across America, Australia, South Africa, and beyond.

ˈkʌzən ˈd͡ʒæk113 viewsLast reviewed Jun 29, 2026+ Add a definition
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#1·Apr 28, 2026

Cousin Jack was a affectionate but sometimes patronizing nickname for a Cornishman, widely used during the 19th and early 20th centuries when Cornish miners emigrated in large numbers to work in mines across America, Australia, South Africa, and beyond. The term spread wherever Cornish mining expertise traveled, and Cornish communities in those countries were often called Cousin Jack settlements. Today it's mainly a historical or heritage term, evoking the Cornish diaspora rather than functioning as active everyday slang.

The old mining camp in Nevada was settled almost entirely by Cousin Jacks who'd brought their hard-rock skills from Cornwall.
Origin: Origin disputed; possibly from Cornish miners' habit of recommending their cousins for work, or from a generic use of 'Jack' as a common name combined with 'cousin' as a friendly address. Editorial expansion authored on Slangora (model-assisted, hedged).
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#2·Apr 26, 2026

(slang, dated) A Cornishman.

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