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double-nickel

[ duhb-uhl-nik-uhl ]
/ ˈdʌb əlˈnɪk əl /
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noun Slang.
the national speed limit of 55 miles per hour as established in 1974 on U.S. highways.
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Origin of double-nickel

First recorded in 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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