知无不言 (zhī) — to say everything one knows; to speak one's mind without reservation

Definition

Examples

• 在会议上，大家知无不言，畅所欲言。
  Zài huì yì shàng, dà jiā zhī wú bù yán, chàng suǒ yù yán.
  At the meeting, everyone spoke freely and said everything on their minds.
• 这位老教授对学生知无不言，毫无保留。
  Zhè wèi lǎo jiào shòu duì xué shēng zhī wú bù yán, háo wú bǎo liú.
  This old professor tells his students everything he knows, holding nothing back.
• 作为朋友，他对我知无不言，让我很感动。
  Zuò wéi péng you, tā duì wǒ zhī wú bù yán, ràng wǒ hěn gǎn dòng.
  As a friend, he was completely open with me, which moved me deeply.