私事 sīshì personal matters
How to remember 私事: 私 personal + 事 matter = personal matters.
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How it is used
- Personal / private matters - 这是我的私事，跟你无关 (zhè shì wǒ de sīshì, gēn nǐ wúguān) this is my private business and none of yours.
- Contrast 公事 (gōngshì, official business). Used to fence off one's own affairs from others' inquiry.