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Jyutping zi6 bat1 doi6 jin4
Pinyin zì bù dài yán

Definitions (Wiktionary)
  1. phrase, idiomatic
    to go without saying; to be self-evident
    (syn.) 不待說, 不用说, 不消說, 没说的, 不言自明, 不用說, 沒說的, 不消说, 不言而喻, 不待说

自不待言 [----]

Jyutping
Pinyin zì bù dài yán

Definitions (CC-CEDICT)
  1. needless to say
  2. it goes without saying