Chinese

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not; no to declare (publicly); to announce
and; as well as; but (not)
and; as well as; but (not); yet (not); (shows causal relation); (shows change of state); (shows contrast)
 
to fight; fight; war
to fight; fight; war; battle
 
trad. (不宣而戰)
simp. (不宣而战)

Pronunciation

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Idiom

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不宣而戰

  1. to open hostilities without declaring war; to start an undeclared war