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Jyutping ming4 bat1 gin3 ging1 cyun4
Pinyin míng bù jiàn jīng zhuàn

Definitions (CC-CEDICT)
  1. (lit.) name not encountered in the classics
  2. unknown (person)
  3. nobody
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be unknown; to be a no-name