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Jyutping zi6 hing1 zi6 zin6
Pinyin zì qīng zì jiàn

Definitions (Wiktionary)
  1. phrase, idiomatic
    to belittle oneself; to demean oneself

自輕自賤 [-轻-贱]

Jyutping
Pinyin zì qīng zì jiàn

Definitions (CC-CEDICT)
  1. to belittle oneself
  2. self-contempt