asphalt jungle
idiomA city or urban area, where the landscape is covered by pavement and the environment is alienating and unsafe.
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concrete jungle
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.
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jungle telegraph
A system used by primitive cultures in remote tropical regions for communication over long distances, such as drum sounds or a relay of runners.
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King of the Jungle
The lion; Panthera leo.