Definition of "sidecar"

sidecar

/ˈsaɪdkɑɹ/

noun
plural sidecars
1. A one-wheeled attachment to the side of a motorcycle to allow for a separate seat for a passenger or cargo space.
2. A cocktail made with cognac (or brandy), triple sec liqueur, and lemon juice.
  Quotations
  Faux 19th-century bartenders in sleeve garters and baroque facial hair ply their trade in pre-Prohibition bars. Women wearing cloche hats order sidecars at speakeasies.
  2011 October 3, Wayne Curtis, “From Tiki to Tacky—and Back”, in The Atlantic‎