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Jyutping man4 fung1 bat1 dung6
Pinyin wén fēng bù dòng

Definitions (CC-CEDICT)
  1. absolutely still
  2. fig. not the slightest change
  3. also written 文風不動|文风不动
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be completely motionless; to be absolutely still
    (syn.) 纹丝不动, 紋絲不動