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double-nickel

[duhb-uh l-nik-uh l]
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noun Slang.
  1. the national speed limit of 55 miles per hour as established in 1974 on U.S. highways.

Origin of double-nickel

First recorded in 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018