隻字不提

只字不提
zhīzìbùtí
(idiom) to say not a single word about it

CEDICT

not say a single word (about something)

Wiktionary

一個字也沒提起。

重編國語辭典

一个字也不談起。比喻有意不說。

維基詞典

Entry Composition

1 隻 zhī classifier for birds and certain animals, one of a pair, some utensils, vessels etc
2 字 zì
  1. letter
  2. symbol
  3. character
  4. word
  5. courtesy or style name traditionally given to males aged 20 in dynastic China

classifier: 個
3 不提 bùtí to not mention