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Discover LudwigThe phrase "fly-by-night" is correct and usable in written English
It is typically used to describe a person or business that is unreliable or transient, often in a negative context. Example: "The fly-by-night contractor left the job unfinished and disappeared without a trace." Alternatives include "unreliable" or "shady."
Dictionary
fly-by-night
noun
A creature which flies at night; a nocturnal flier or traveler.
Exact(53)
"Unfortunately, he helped perpetuate stereotypes of independent film producers being fly-by-night operations".
"He's no fly-by-night charlatan.
"This is not fly-by-night stuff".
It's not a fly-by-night operator".
And it's not a fly-by-night operation.
"LimeWire was not a fly-by-night operation," he said.
Similar(7)
– Fly by Night Truth is dangerous.
– Fly by Night Do you know what courage is?
– Fly by Night Everybody knew that books were dangerous.
They're "very good investors not fly by night" ones.
Do owls and bats fly by night?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com