Wiktionary
back alley
n. An alleyway that runs behind a row of houses, or between rows of houses
Usage examples of "back alley".
One to the service counter (with the forehead-shaped dent in it), the other presumably to the back alley.
It could be she was cornered in an Alientown back alley, fighting for her life against the Cats.
It was a second staircase used for carrying garbage to the bins in the back alley.
By the way, Inspector, how did you happen to be in a back alley, off a side street, in the middle of a Tuesday morning?
It led to a loading-dock area that was off the back alley Bosch had walked through the night before.