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mad money

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noun Informal.
a small sum of money carried or kept in reserve for minor expenses, emergencies, or impulse purchases.
a small sum of money carried by a woman on a date to enable her to reach home alone in case she and her escort quarrel and separate.
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Origin of mad money

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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