back-alley

[ bak-al-ee ]
/ ˈbækˈæl i /

adjective

dirty, unprepossessing, sordid, or clandestine: back-alley morals; back-alley political schemes.

Origin of back-alley

An Americanism dating back to 1860–65

Idioms and Phrases with back alley

back alley

see under back street.