birdcage

[ burd-keyj ]

/ ˈbɜrdˌkeɪdʒ /

a cage for confining birds.

something that resembles a birdcage in form.

Slang. the airspace over an airport, together with the airplanes in it.

Origin of birdcage

First recorded in 1480–90; bird + cage

I suspect this is owing to what passed in the House about opening the Birdcage Walk.

The Greville Memoirs |Charles C. F. Greville
Then her sister rose and took in a birdcage from outside the window, where it had hung, but I had not seen it.

Charles Auchester, Volume 2 (of 2) |Elizabeth Sheppard
The tall man with the nervous, irritable face and the little girl with the birdcage in her hand.

Mary Rose of Mifflin |Frances R. Sterrett
Near the sink was an open cupboard with three shelves, broad and high enough to hold a birdcage.

Mary Rose of Mifflin |Frances R. Sterrett

She slipped down and ran into the next room to come back with a birdcage.

Mary Rose of Mifflin |Frances R. Sterrett

birdcage

/ (ˈbɜːdˌkeɪdʒ) /

a wire or wicker cage in which captive birds are kept

any object of a similar shape, construction, or purpose

Australian and NZ an area on a racecourse where horses parade before a race

NZ informal a second-hand car dealer's yard