fly-by-night

剑桥词典

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.
（公司或商人）不可靠的，无信用的
a fly-by-night operator /organization 不可靠的经营者／机构 返回 fly-by-night