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The phrase "under false colors" is correct and usable in written English.
It is typically used to describe someone who is pretending to be something they are not, often for deceptive purposes. Example: "The spy operated under false colors, posing as a diplomat to gather intelligence."
Idiom
Sail under false colors.
Someone who sails under false colors is hypocritical or pretends to be something they aren't in order to deceive people.
Exact(7)
"I'm completely sailing under false colors," said Ms. Eisenberg, with a sigh.
Blood sails under false colors - that is to say, most of the time - he doesn't really like it.
What seizes Joseph Skizzen (who will, under false colors, become Professor Skizzen, Whittlebauer College's published and respected professor of music), what claws at his brain, are the pullulations of all the world's evils.
It should also in this connection be pointed out that many cases published under the category HC, sail under false colors.
"I didn't want to fly under false colors," he said.
Supporters of Amendments 5 and 6 challenged Amendment 7 in court as "flying under false colors".
Similar(52)
In particular, false colors and light-flickering problems are described.
For chrominance enhancement, applying Retinex independently to three color channels (RGB) usually results in false colors and hue-shift.
As a result, false colors may occur in the achromatic regions.
Both images were overlaid and are represented in false colors.
For presentation, false colors replaced the monochrome image.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com