The child suddenly developed a barking cough, and the doctor said it was croup.

croup 是医学名词，指"哮吼"，这是一种儿童常见的喉部和气管炎症，会导致特征性的"犬吠样咳嗽"和呼吸困难。这个词来自古英语"kropan"，原意是"叫喊、啼哭"，后来专指这种特殊的咳嗽症状。