to sail under false colors
- idiom
- Informal
- She sailed under false colors by pretending to be a fellow employee, which allowed her to access confidential files.
Examples
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By sailing under false colors, he managed to get into the exclusive event without an invitation.
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I have been sailing under false colors.
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The spy was sailing under false colors to gather sensitive information from competitors.
Synonyms
To make someone believe something that is not true to get an advantage
To pretend to be someone you are not to trick people
To pretend to be someone else to hide the truth
To make something or someone look real when they are not
To trick someone by hiding the truth
To put on clothes or a mask to hide who you are
Pretend to be a person or website online to trick people
To pretend to be or feel something to trick people
Pretend to be another person to trick people or act in a role
To trick someone by pretending to be something they are not
To trick someone who trusts you by hiding your real plans to get something for yourself
Antonyms
How Deceptive
Surface Forms
Morphology
The literal parts — 'sail' + 'under' + 'false' + 'colors' — describe the image of a ship sailing beneath fake flags, so a learner can plausibly infer a meaning related to deception. However, the specialized maritime sense of 'colors' = 'flag/identity' and the conventionalized extension to 'pretend to be someone/something else to gain advantage' are somewhat idiomatic and culturally specific, so the full meaning is not fully predictable without prior exposure.
Etymology
The idiom sail under false colors may come from old sailors who would sail showing another ship's flag as their colors to look friendly and hide what they really wanted. That's why it now means 'to deceive others by pretending to be someone else'.