一丝一毫 yī sī yī háo

DEFINITIONS

  1. one thread, one hair (idiom); a tiny bit
  2. an iota

CHARACTERS

一 yī
HSK 1
one; a, an; alone
丝 sī
HSK 5
silk; fine thread; wire; strings
一 yī
HSK 1
one; a, an; alone
毫 háo
HSK 5
fine hair; measure of length