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bluing

American  
[bloo-ing] / ˈblu ɪŋ /
Or blueing

noun

Chemistry.

  1. a substance, as indigo, used to whiten clothes or give them a bluish tinge.

Etymology

Origin of bluing

First recorded in 1660–70; blue + -ing 1

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.