千钧一发

千鈞一髮
qiānjūnyīfà
  1. lit. a thousand pounds hangs by a thread (idiom)
  2. fig. (at the) critical; perilous (moment)

CEDICT

Entry Composition

=1 千 qiān thousand
=1 千 qiān used in 秋千 qiūqiān
2 钧 jūn
  1. 30 catties
  2. great
  3. your (honorific)
3 一 yī
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit
4 发 fà
  1. hair
  2. Taiwan pr. fǎ