不約而同

不约而同
bùyuēértóng
(idiom) (of two or more people) to take the same action without prior consultation; (usu. used adverbially) all (or both) of them, independently; as if by prior agreement

CEDICT

Entry Composition

1 不 bù
  1. no; not so
  2. (bound form) not; un-
2 約 yuē
  1. to make an appointment
  2. to invite
  3. approximately
  4. pact
  5. treaty
  6. to economize
  7. to restrict
  8. to reduce (a fraction)
  9. concise
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 同 tóng
  1. like
  2. same
  3. similar
  4. together
  5. alike
  6. with