Pronunciation (UK) IPA (key): /ˈsɪnjuː/ (US) IPA (key): /ˈsɪnju/ Audio (AU)(file) Hyphenation: sin‧ew Noun Singular sinew Plural sinews (anatomy) A sinew is a cord or tendon of the body. (music) A sinew is a cord or string of a musical instrument.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads