不言不語 [－－－语]

Jyutping bat1 jin4 bat1 jyu5
Pinyin bù yán bù yǔ

Definitions (CC-CEDICT)
  1. to not say a word (idiom)
  2. to keep silent
Definitions (Wiktionary)
  1. phrase, idiomatic
    to not say a word; to keep silent
    (syn.) 悶聲不響, 闷声不响