back alley
noun [ C ] uk/ˈbæk ˌæl.i/ us/ˈbæk ˌæl.i/
陋巷（建筑物后或之间的狭窄通道，尤指市镇相对破旧、贫穷地区的）
a narrow passage behind or between buildings, especially in the older and poorer areas of a town or city
They were born into poverty and learned their trade in the back alleys of Naples, New York, or Chicago. 他们出身贫穷，在那不勒斯、纽约及芝加哥的陋巷中学到了自己的手艺。