The idiom "know which side one's bread is buttered on" has its origins in the practice of buttering bread. The phrase has been in use for centuries and was used both literally and figuratively. In a literal sense, it referred to the act of spreading butter on one side of a slice of bread to make it more palatable. Figuratively, it is now used to advise someone to recognize their own best interests and make choices that benefit them.

What is the origin of the idiom "know which side one's bread is buttered on" and when to use it?

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to [know] which side {one's} bread is buttered on

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英語での「know which side one's bread is buttered on」の定義と意味

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