heart is in mouth

somebody's heart is in their mouth

if someone's heart is in their mouth, they feel extremely nervous My heart was in my mouth as I walked onto the stage.

Name	Pronounced	Usage
Briar	BRIE-ər	English (Rare)
Joye	[dʒɔi]
Ketill	-	Ancient Scandinavian
Lilian	LIL-ee-ən (English)	English, French
Baer	BER	Limburgish
Shmuel	-	Hebrew