The idiom "funny business" has been in use since the early 20th century and conveys the idea of actions or dealings that may not be entirely trustworthy. It is often used in a lighthearted or casual manner, but can also convey a more serious tone when referring to potentially unethical conduct.

What is the origin of the idiom "funny business" and when to use it?

英語での「funny business」の定義と意味

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