someone's knees are knocking

idiom

Definition of someone's knees are knocking

informal
used to say that a person's knees are shaking from nervousness or fearHer knees were knocking in terror.

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“Someone's knees are knocking.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/someone%27s%20knees%20are%20knocking. Accessed 28 Oct. 2020.

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