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English definition of “knock sb up”

knock sb up

(WAKE UP) UK informal phrasal verb with knock     /nɒk/ US  /nɑːk/ verb
to wake someone up by knocking on the door of their house or bedroom: I'm sorry to have to knock you up in the middle of the night.Not sleeping and not unconscious
(Definition of knock sb up (WAKE UP) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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