Meaning of the word "someone's heart is in their mouth" in English

What does "someone's heart is in their mouth" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

someone's heart is in their mouth

US /ˈsʌm.wʌnz hɑːrt ɪz ɪn ðer maʊθ/
UK /ˈsʌm.wʌnz hɑːrt ɪz ɪn ðer maʊθ/
"someone's heart is in their mouth" picture

Idiom

1.

to feel very nervous or frightened

Example:
When the roller coaster started, my heart was in my mouth.
Her heart was in her mouth as she waited for the exam results.
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