There are several sayings in English involving bread and butter, which probably reflect the historic importance of bread to the European diet. This is perhaps the most widely used today, and means "I know where my interests lie." This might mean that you would take your boss's side in a dispute, for instance, because he/she pays your wages.
Another saying is "It's my bread and butter" which really means "It's how I earn my living" (the implication is often that it's an activity you don't much enjoy for its own sake, as in "I don't really like selling, but it's my bread and butter.")
Quite different is the jokey remark "Why does bread always fall butter side down on the carpet?" The idea here is that we all tend to think events are against us, and that things have a way of working out badly (it's like the idea that if you carry an umbrella, it won't rain, but if you don't, it will.)
Another saying is "It's my bread and butter" which really means "It's how I earn my living" (the implication is often that it's an activity you don't much enjoy for its own sake, as in "I don't really like selling, but it's my bread and butter.")
Quite different is the jokey remark "Why does bread always fall butter side down on the carpet?" The idea here is that we all tend to think events are against us, and that things have a way of working out badly (it's like the idea that if you carry an umbrella, it won't rain, but if you don't, it will.)
