Compounds are fun, and one fun thing about them is that their lexical meanings can be overwritten by ad-hoc meanings. "Monkey business" below is an example where the ad-hoc meaning is actually one that follows an established pattern. While the lexicalized meaning for "monkey business" is 'mischievous, suspect, or dishonest behaviour or acts', below it means 'business involving monkeys', a pattern common enough in compounds ending in business ("fashion/publishing/music business" etc)
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