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Bread and butter issues are ones that affect people directly and in a very important way.

He’s a professional golfer, so I guess you could say that playing golf is his bread and butter.

When I got back from the sales meeting, I took two days to write bread-and-butter letters to the people I met.

«Microsoft's Windows operating system is its bread and butter. Even so, Microsoft has expanded into the video game console market, where it competes with Sony and Nintendo.»