Daily Chinese Idiom Guessing Game
To be extremely anxious or scared, with one's heart in one's mouth.
形容十分担心或害怕。
明·吴承恩《西游记》第十七回众僧闻得此言，一个个提心吊胆，告天许愿。”
She was on tenterhooks waiting for the test results, feeling like her heart was in her throat.