If an idea or emotion comes across in writing, film, music, or when someone is speaking, it is expressed clearly and people notice it:
Come knocking
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to repeatedly hit something, producing a noise:
Come knocking meaning & definition 1 of Come knocking.
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If an engine is knocking, it is producing a repeated high sound either because the fuel is not burning correctly or because a small part is damaged and is therefore allowing another part to move in ways that it should not.
Come knocking meaning & definition 2 of Come knocking.
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