Usually means: Unreliable, disappearing after quick profit.
Definitions Related words Mentions Lyrics
We found 25 dictionaries that define the word fly-by-night:

General (20 matching dictionaries)
  1. fly-by-night: Merriam-Webster
  2. fly-by-night: Oxford Learner's Dictionaries
  3. fly-by-night: American Heritage Dictionary of the English Language
  4. fly-by-night, fly-by-night: Collins English Dictionary
  5. fly-by-night: Vocabulary.com
  6. fly-by-night: Wordnik
  7. fly-by-night: Cambridge Advanced Learner's Dictionary
  8. fly-by-night: Wiktionary
  9. fly-by-night: Webster's New World College Dictionary, 4th Ed.
  10. fly-by-night: Infoplease Dictionary
  11. fly-by-night: Dictionary.com
  12. fly-by-night: Online Etymology Dictionary
  13. fly-by-night: Cambridge Essential American English Dictionary
  14. fly-by-night: Rhymezone
  15. Fly-by-night: Dictionary of Phrase and Fable (1898)
  16. fly-by-night: FreeDictionary.org
  17. fly-by-night: Mnemonic Dictionary
  18. fly-by-night: TheFreeDictionary.com

Business (3 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. Travel Industry Dictionary (No longer online)
  3. fly-by-night: Legal dictionary

Miscellaneous (1 matching dictionary)
  1. fly-by-night: Idioms

Slang (1 matching dictionary)
  1. fly-by-night, fly-by-night: Green’s Dictionary of Slang

(Note: See fly-by-nights as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A creature which flies at night; a nocturnal flier or traveler.
noun:  (often attributive) One who departs or flees at night in order to avoid creditors, law enforcement etc.
noun:  (idiomatic, derogatory) A person or business that appears and/or disappears rapidly, appearing untrustworthy, or giving an impression of transience.
noun:  (idiomatic, derogatory) A traveling businessman or tradesman.

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