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false colors

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plural noun
the flag of a country other than one's own, especially when used deceptively: sailing under false colors.
false or deceptive actions or statements; misrepresentation.
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Origin of false colors

1565–75, for literal sense
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use false colors in a sentence

Other Idioms and Phrases with false colors

false colors

Pretense, misrepresentation, or hypocrisy; deceptive statements or actions. For example, She's sailing under false colors—she claims to be a Republican, but endorses Democratic legislation. This term alludes to the practice of pirate ships sailing under false colors—that is, running a particular flag specifically to lure another vessel close enough to be captured. [Late 1600s]

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