double-nickel

[ duhb-uhl-nik-uhl ]

noun

, Slang.

1. the national speed limit of 55 miles per hour as established in 1974 on U.S. highways.

Word History and Origins

Origin of double-nickel¹

First recorded in 1975–80

Example Sentences

Dissolve a few green crystals of "double nickel salts" in water, until the water is a clear green.

From Project Gutenberg