不翼而飛

不翼而飞
bùyìérfēi
  1. to disappear without trace
  2. to vanish all of a sudden
  3. to spread fast
  4. to spread like wildfire

CEDICT

Entry Composition

1 不 bù
  1. no; not so
  2. (bound form) not; un-
2 翼 yì
  1. wing
  2. area surrounding the bullseye of a target
  3. to assist
  4. one of the 28 constellations of Chinese astronomy
  5. old variant of 翌
3 而 ér
  1. and
  2. as well as
  3. and so
  4. but (not)
  5. yet (not)
  6. (indicates causal relation)
  7. (indicates change of state)
  8. (indicates contrast)
4 飛 fēi to fly