毫釐不爽

毫厘不爽
háolíbùshuǎng
  1. not to deviate an iota (idiom)
  2. to be extremely accurate

CEDICT

絲毫不差，非常準確。如：「他向來料事如神，毫釐不爽。」也作「毫髮不爽」。

重編國語辭典

Entry Composition

1 毫釐 háolí a very small amount
2 不爽 bùshuǎng
  1. not well
  2. out of sorts
  3. in a bad mood
  4. without discrepancy
  5. accurate

Related entries

毫髮不爽 háofàbùshuǎng
  1. not to deviate one hair's breadth (idiom)
  2. to be extremely accurate