"Concrete jungle" refers to the urban city; first used in cinema by Academy Award winning "The Lost Weekend" (1945), directed by Billy Wilder, starring Ray
Milland.
Milland's character,
Don Birnam, a chronic alcoholic, and binge drinker, speaks of others with the same condition in the "concrete jungle" as the camera pans across a skyline of Manhattan as an epilogue to the story.