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someone's heart sinks

idiom

—used to say that someone feels very sad
Her heart sank at the thought of moving so far away.

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someone's heart is knocking
someone's heart sinks
someone's knees are knocking
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“Someone's heart sinks.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/someone%27s%20heart%20sinks. Accessed 26 Nov. 2025.

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