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fly-by-night (n.)

1796, slang, said by Grose to be an old term of reproach to a woman signifying that she was a witch; used from 1823 in reference to anyone who departs hastily from a recent activity, especially while owing money. The different senses involve the two verbs fly.

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Definitions of fly-by-night from WordNet
1
fly-by-night (adj.)
(of businesses and businessmen) untrustworthy or undependable;
a fly-by-night operation
fly-by-night (adj.)
ephemeral;
the symphony is no fly-by-night venture
2
fly-by-night (n.)
a debtor who flees to avoid paying;
From wordnet.princeton.edu

Dictionary entries near fly-by-night

flutist

flutter

fluvial

flux

fly

fly-by-night

flyer

flying

Flynn

fly-over

flypaper