Mmm… this morning I just ate a slice of bread, salad, and butter but I feel very fresh and strong. Yes, I need to have breakfast every morning before I go to work because I am going to go to my bread and butter. I love my bread and butter so much because I need to buy bread and butter for breakfast.
Bread and butter is an English Idiom meaning a job or activity that provides us with money. But In the above paragraph, the last “bread and butter” does not mean a job, so you need to pay attention to the context when defining “bread and butter”.