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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/organization
(Definition of fly-by-night from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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