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mammoth jack

[ mam-uhth jak ]
/ ˈmæm əθ ˈdʒæk /
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noun
Informal. a notably large male donkey.
any of various large donkey breeds, including the American mammoth donkey , a landrace bred for strength from several donkey breeds brought into America in the 18th century.
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Origin of mammoth jack

First recorded in 1835–40; jack1 (in the sense “male donkey, jackass”)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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