Learn what "what business is" means, when people say it, and how to use it naturally in English.

It means the speaker is telling someone they should not interfere or ask about this.
From Married To A Stranger, Episode 25
He challenges the other person and suggests it is none of their business.
Use this when you want to push back on an intrusive question. It sounds hostile and is best understood, not used casually.
Scenes unlock real expressions as you watch
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Reinforce with quick quizzes and repetition
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