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 20 Jan. 2022.
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