false colors

plural noun

1. the flag of a country other than one's own, especially when used deceptively:

   sailing under false colors.

2. false or deceptive actions or statements; misrepresentation.

Word History and Origins

Origin of false colors¹

1565–75, for literal sense

Idioms and Phrases

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]

Example Sentences

Syrup Cocillana Compound is a nostrum sailing under false colors.

From Project Gutenberg

It would seem, he said, from what he could learn, that Tillotson's honorable opponent was sailing under false colors.

From Project Gutenberg

To be constantly forced to move under false colors was a bitter thing for Ezra.

From Project Gutenberg

If false colors are carried we must find it out because they carry no notice to warn us.

From Project Gutenberg

These are mighty captains, and flaunt their false colors in the daily newspapers which come to our firesides.

From Project Gutenberg