Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
cock-a-hoop is an adjective meaning "exhibiting self-importance". It carries one recorded sense.
exhibiting self-importance
“big talk”
Definitions, synonyms and semantic relations for cock-a-hoop come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.