吃早饭是动词短语，breakfast早餐，英文表达为eat breakfast，不是单词。

1、All the ladies breakfasted in their rooms.所有女士都在她们的房间里吃早餐。

2、For breakfast I had a thick slice of bread and syrup.早餐我吃了一片厚厚的涂了糖浆的面包。