1. a cage for confining birds.
  2. something that resembles a birdcage in form.
  3. Slang. the airspace over an airport, together with the airplanes in it.


  1. a wire or wicker cage in which captive birds are kept
  2. any object of a similar shape, construction, or purpose
  3. Australian and NZ an area on a racecourse where horses parade before a race
  4. NZ informal a second-hand car dealer’s yard

also bird-cage, late 15c., from bird (n.1) + cage (n.).

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