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

1.
心都提到嗓子眼了, 非常紧张
to feel very nervous or frightened
:
•
When the roller coaster started, my heart was in my mouth.
当过山车启动时,我的心都提到嗓子眼了。
•
Her heart was in her mouth as she waited for the exam results.
她等待考试结果时,心都提到嗓子眼了。