1 . A type of food made from flour and water that is mixed together and then baked: bánh mì

    Would you like some bread with your soup?

   A loaf of brown bread

   A piece of bread and butter

 2 . your/somebody’s bread and butter

informal the work that provides you with most of the money that you need in order to live
công việc cung cấp cho bạn hầu hết số tiền bạn cần để sống

   Writing is my bread and butter.

 3 . know which side your bread is buttered on: biết phía nào bánh mì của bạn có bơ

informal to know which people to be nice to in order to get advantages for yourself
biết ai là người tốt đẹp để có được lợi thế cho mình