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Jyutping si1 hou4 bat1 caa1
Pinyin sī háo bù chā

Definitions (CC-CEDICT)
  1. accurate to perfection (idiom)
  2. precise to the finest detail
Examples (粵典–words.hk)
  1. Cantonese
    丝毫不差
    絲毫不差
    si1 hou4 bat1 caa1
    • not to err by a hair's breadth