Английский словарь американских идиом - fly-by-night(2)

{n.}, {informal} 1. A company that sells many cheap things for a big profit and then disappears. * /A dependable company honors its guarantees, but a fly-by-night only wants your money./ 2. A person who does not pay his bills, but sneaks away (as at night.) * /Hotels are bothered by fly-by-nights./