sb's heart is in his/her mouth Meaning in Cambridge English Dictionary
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Meaning of "sb's heart is in his/her mouth" - English Dictionary

sb's heart is in his/her mouth

If someone's heart is in their mouth, they are feeling extremely nervous: My heart was in my mouth when I opened the letter.
(Definition of sb's heart is in his/her mouth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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