- (idiomatic) An urban or other populated area containing a high density of buildings constructed of concrete or similar materials, especially one which lacks greenery and which seems unattractive, harsh, or unsafe.
1948 April 9, Richard Coe, “Hellinger Mixed Real Manhattan”, in Washington Post, page 24:
- There is nothing quite like the affection of a transplanted New Yorker for his native concrete jungle.
2007 October 29, “Spain aims to restore overdeveloped coastlines to a more natural look”, in International Herald Tribune:
- Spain plans to restore a fifth of its coastline from overdeveloped concrete jungle to a more natural state.