Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “fly-by-night”

fly-by-night

adjective [before noun] uk   /ˈflaɪ.baɪ.naɪt/ informal disapproving us  
Fly-by-night companies or business people cannot be trusted because they are likely to get into debt and close down the business to avoid paying the debts or satisfying agreements: a fly-by-night operator/organizationDishonestStarting, succeeding and failing in business
(Definition of fly-by-night from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of fly-by-night?
Add Cambridge dictionaries to your browser to your website

Definitions of “fly-by-night” in other dictionaries

Translations of “fly-by-night”

Word of the Day

roost

When birds roost, they go somewhere to rest or sleep.

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More