A usually small and narrow street or alley, especially one in inferior or poorer parts of a city, away from the centre.(noun)
A secret, clandestine or illegal scene.(noun)
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Use "back street" in a sentence
"The Tyrians fought back street by street with the desperation of those who have no hope of mercy."
"How sweet the air does smell — even the air of a back street in the suburbs — after the shut-in, subfaecal stench of the spike!"
"He went back to his undergraduate days and saw himself drinking coffee in a shabby teashop in a Cambridge back street where, behind a thin green curtain, an appalling gramophone ground out the plummy mouthings of a tenth-rate ballad singer."