sb's heart is in his/her mouth Meaning in the Cambridge English Dictionary
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Meaning of “sb's heart is in his/her mouth” in the English Dictionary

"sb's heart is in his/her mouth" in British English

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sb's heart is in his/her mouth

If someone's heart is in ​theirmouth, they are ​feelingextremelynervous: 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 Learner’s Dictionary & Thesaurus © Cambridge University Press)
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