间不容发
jiān​bù​róng​fà

by a hair's breadth

  1. 间 間 jiàn noun
    gap
    (bound form) gap; opening; crevice; space in between
  2. 不 bu particle
    [potential]
    Used between a verb and its result to show that the action cannot achieve that result; used as the negative form of the 得 de potential construction
  3. 容 róng verb
    to hold
    to hold; to contain; to accommodate; to have a capacity of
  4. 发 髮 fà noun
    hair
    (bound form) hair on the human head