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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.
fast-breaking is an adjective meaning "occurring rapidly as a series of events in rapid succession". It carries one recorded sense.
occurring rapidly as a series of events in rapid succession
“the broadcast was interrupted by a fast-breaking news story about the invasion”
news article
Definitions, synonyms and semantic relations for fast-breaking come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .