过来人 (guō) — someone who has been through a particular experience (and thus can offer insight or advice)

Definition

Examples

• 他是过来人，你可以问问他。
  Tā shì guō, nǐ kě yǐ wèn wèn tā.
  He has been through it, you can ask him.
• 作为过来人，我劝你不要这样做。
  Zuò wéi guō, wǒ quàn nǐ bú yào zhè yàng zuò.
  As someone who has been through it, I advise you not to do this.
• 只有过来人才知道其中的辛苦。
  Zhǐ yǒu guō cái zhī dào qí zhōng de xīn kǔ.
  Only someone who has been through it knows the hardship.