Bread and Butter: Definition, Meaning, and Origin
https://usdictionary.com/idioms/bread-and-butter/
WEBAugust 2, 2023. The idiom "bread and butter" has several meanings, depending on the context and usage, but the most common is that it pertains to the primary source of income or livelihood for someone or something. In short: The idiom pertains to the chief method of generating income or providing for oneself for a human or a non-human.
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