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Meaning of fly-by-night

fly-by-night

Pronunciation: (flī'bī-nīt"), [key]
— adj.
  1. not reliable or responsible, esp. in business; untrustworthy: a fly-by-night operation.
  2. not lasting; brief; impermanent; transitory: a fly-by-night theater.
—n.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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