(British, historical) A person whose job was to go from house to house in the early morning and wake up workers by tapping on the bedroom window with a long pole or similarly convenient implement.
... And Capper was a very important man. He was the knocker-up in the village of Polkingthorpe Brig — that is to say, he got up early every morning and went round with his pole, tapping on the bedroom windows and waking up the people in …
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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