One of the mysteries of the English language finally explained.
1historical Any of various boys or men who wear blue clothing, or a blue uniform, livery, etc.; especially a boy who attends a blue coat school or similar charitable institution (now chiefly historical).
2slang Slang. A policeman. Also as a nickname. Usually in plural Compare "boys in blue".
Mid 17th century; earliest use found in William Davenant (1606–1668), poet, playwright, and theatre manager. From blue + boy.
blue boy/ˈbluː bɔɪ/
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