Have (one's) heart in (one's) mouth American British informal verb phrase
If you say your heart is in your mouth, you mean that you are extremely nervous and fearful.
By the time I got into the interview, I had had my heart in my mouth.
I have my heart in my mouth when the old man looks at me like that.
I had my heart in my mouth as I waited for my presentation.
Used to tell someone not to stress about something
To shake a lot due to the cold or fear
be so excited or nervous about that something and want to know what is going to happen next
To be very anxious
The verb "have" should be conjugated according to its tense.
Being perfectly suitable for one's interests or abilities
Jasmine really loves children, so being a kindergarten teacher would be right up her alley.