Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
knocked-out is an adjective meaning "damaged". It carries one recorded sense.
damaged
“the gym has some of the most knocked-out equipment since Vic Tanny”
colloquialism
Definitions, synonyms and semantic relations for knocked-out come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.