(also someone's heart is in their shoes)心情很不好;很失望;很担忧 If someone's heart is in their boots or shoes, they feel very sad, disappointed, worried, etc.
Their hearts were in their boots when they realized that they would have to do the work all over again. 当发现将不得不全部从头再来时，他们的情绪十分低落。
He left her feeling like his heart was in his shoes.