sidecar Syllabification: (side·car)Pronunciation: /ˈsīdˌkär/Translate sidecar | into German | into Spanish Definition of sidecar noun 1a small, low vehicle attached to the side of a motorcycle for carrying passengers. 2a cocktail of brandy and lemon juice with orange liqueur. sidecar in other Oxford dictionaries Definition of sidecar in the British & World English dictionary