Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
nail-biting is an adjective meaning "(of a situation) characterized by or causing suspense". It carries one recorded sense.
(of a situation) characterized by or causing suspense
Definitions, synonyms and semantic relations for nail-biting come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.