sidecarPronunciation: /ˈsʌɪdkɑː/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. 3another term for jaunting car.sidecar in other Oxford dictionaries Definition of sidecar in the US English dictionary