Definition of knocker-up in English:

knocker-up

Line breaks: knocker-up

noun (plural knockers-up)

British historical
  • A person employed to rouse workers by knocking at their doors or windows.
    More example sentences
    • He remembers gas lamps and the days when the ‘knocker-up’ did his rounds waking up the mill workers.

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody