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double-nickel

[duhb-uh l-nik-uh l] /ˈdʌb əlˈnɪk əl/
noun, Slang.
1.
the national speed limit of 55 miles per hour as established in 1974 on U.S. highways.
Origin
1975-1980
1975-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Slang definitions & phrases for double nickel

double nickel

noun phrase
  1. The 55-mile-per-hour speed limit (1970s+ Citizens band)
  2. Interstate Highway 55, running south from Chicago (1980s+)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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