The exact origin of the idiom is unclear, but it is thought to have originated in the early 1900s. The phrase is likely a metaphor for the physical act of knocking someone over, which can be caused by a sudden and unexpected force. In the figurative sense, the idiom is used to describe something that is so impressive or surprising that it causes someone to be completely stunned or amazed. It is often used to describe a positive experience in everyday conversation as it is an informal idiom, however, it is not considered offensive or taboo, and it can be used in a variety of contexts

What is the origin of the idiom "knock someone of one's feet" and when to use it?

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to [knock] {sb} off {one's} feet

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Определение и значение слова « knock somebody off one's feet» на английском языке

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