collarbone Syllabification: (col·lar·bone)Pronunciation: /ˈkälərˌbōn/Translate collarbone | into French | into German | into Italian | into Spanish Definition of collarbone noun either of the pair of bones joining the breastbone to the shoulder blades. Also called clavicle.collarbone in other Oxford dictionaries Definition of collarbone in the British & World English dictionary