adjective[ before noun ]informaldisapprovinguk/ˈflaɪ.baɪ.naɪt/us/ˈflaɪ.baɪ.naɪt/
(公司或商人)不可靠的,无信用的
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.