(as) black as Newgate's knocker

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(as) black as Newgate's knocker

dated Completely black; totally without light or color. Refers to the black iron knocker on the door of Newgate Prison in London. Primarily heard in UK. The basement gives me the creeps, it's as black as Newgate's knocker down there!
See also: black, knocker
References in periodicals archive ?
Q WHEN I'd get dirty as a child, my mum used to say: "You're as black as Newgate's knocker.
Q MY mother would often use the expression, "It's as black as Newgate's knocker.