不宣而戰 bù xuān ér zhàn

DEFINITIONS

  1. open hostilities without declaring war
  2. start an undeclared war

CHARACTERS

不 bù
HSK 1
no, not; un-; negative prefix
宣 xuān
HSK 5
declare, announce, proclaim
而 ér
HSK 3
and; and then; and yet; but
戰 zhàn war, fighting, battle