Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
record-breaking is an adjective meaning "surpassing any previously established record". It carries one recorded sense.
surpassing any previously established record
“a record-breaking high jump”
“record-breaking crowds”
Definitions, synonyms and semantic relations for record-breaking come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.