someone's heart is knocking
idiomatic phrase
informal
—used to say that a person's heart is beating very hard, usually from nervousness or excitement
His heart was knocking as he waited to meet his date.
Cite this Entry
“Someone's heart is knocking.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/someone%27s%20heart%20is%20knocking. Accessed 5 Nov. 2025.
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Merriam-Webster unabridged
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