jack mormon

noun

sometimes capitalized J & usually capitalized M

1

: a non-Mormon living in a Mormon community and sympathetic to or on friendly terms with his neighbors

2

: a Mormon inactive in the church or not adhering strictly to Mormon tenets : a backsliding or nominal Mormon

always paid his tithes—only he had to have his coffee so some called him a jack Mormon

—American Guide Series: Arizona

a jack Mormon, which means that … he no longer pays tithes or holds with the tenet of total abstinence

—A. J. Liebling

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