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Jyutping bat1 jat1 zi3 zi6
Pinyin bù yī zhì zì

Definitions (CC-CEDICT)
  1. (orthography) inconsistent words (e.g. "through", "bough" and "rough", where "-ough" is not pronounced the same in each case)
  2. inconsistent characters (e.g. 流[liu2], 梳[shu1] and 毓[yu4], which are pronounced differently from each other even though they all have the same notional phonetic component)