Cách sử dụng
When someone's heart is in their mouth, it means they are feeling very anxious, nervous or scared about something. It is an idiomatic expression and is not to be taken literally. It is often used to describe a situation when someone is expecting a bad outcome or is experiencing something intense like horror or shock. For example, when waiting for exam results or a job interview, someone might say "my heart is in my mouth" to describe how nervous they feel.