不約而同 bù yuē ér tóng

DEFINITIONS

  1. to agree by chance (idiom); taking the same action without prior consultation

CHARACTERS

不 bù
HSK 1
no, not; un-; negative prefix
約 yuē treaty, agreement, covenant
而 ér
HSK 3
and; and then; and yet; but
同 tóng
HSK 1
same, similar; together with