heart in one's mouth

idiom

Definition of heart in one's mouth

informal
: to be very excited or nervous about something anticipated He waited for her arrival with his heart in his mouth. You sure don't seem relaxed—in fact, it seems like your heart is in your mouth.

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“Heart in one's mouth.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heart%20in%20one%27s%20mouth. Accessed 28 Feb. 2020.

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