一字不漏

yīzìbùlòu
without missing a word

CEDICT

一个字也不遗漏。形容听说读写认真仔细。

維基詞典

Entry Composition

1 一字 yīzì in a row; in a line
2 不 bù
  1. no; not so
  2. (bound form) not; un-
3 漏 lòu
  1. to leak
  2. to divulge
  3. to leave out by mistake
  4. waterclock or hourglass (old)