Definition of fly–by–night
1 : one that seeks to evade responsibilities and especially creditors by flight
2 : one without established reputation or standing; especially : a shaky business enterprise
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1822
First Known Use of fly–by–night
1822
2
fly–by–night
adjective
Definition of fly–by–night
1 : given to making a quick profit usually by shady or irresponsible acts
2 : transitory, passing fly–by–night fashions
1914
First Known Use of fly–by–night
1914
FLY–BY–NIGHT Defined for English Language Learners
fly-by-night
adjective
Definition of fly–by–night for English Language Learners
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: trying to make money quickly by using dishonest or illegal methods
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