Players knock up before beginning a game of tennis or similar sport by hitting the ball to each other:

]]>https://definedictionarymeaning.com/topic/286717/to-knock-sb-upRSS for NodeMon, 15 Jun 2026 22:34:55 GMTSun, 19 Feb 2023 13:25:56 GMT60to wake someone up by knocking on the door of their house or bedroom:

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