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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
fly-by-night is an adjective and noun meaning "(of businesses and businessmen) untrustworthy or undependable". It carries 3 recorded senses.
(of businesses and businessmen) untrustworthy or undependable
“a fly-by-night operation”
a debtor who flees to avoid paying
Definitions, synonyms and semantic relations for fly-by-night come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.