Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
muscle-bound is an adjective meaning "having stiff muscles as the result of excessive exercise". It carries one recorded sense.
having stiff muscles as the result of excessive exercise
“he arrived accompanied by two muscle-bound body guards”
Definitions, synonyms and semantic relations for muscle-bound come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.