act of war

noun

1. an act of aggression by a country against another with which it is nominally at peace.

act of war

noun

1. an aggressive act, usually employing military force, which constitutes an immediate threat to peace

Example Sentences

Pyongyang considers Seoul's propaganda broadcasts an act of war and has threatened to blow up the speakers in the past.

From BBC

Any formal declaration as such would be considered as an act of war by Beijing.

From BBC

"When two countries are bombing each other daily in a hot war, and a third country joins the bombing, that's an act of war," Massie wrote on social media, arguing the president should have sought congressional approval before getting involved.

From BBC

My job, now, is to witness that which the internet allows me to see, and to call it what it is: a genocide, a famine, a brazen act of war.

From Slate

By his own acknowledgement, however, key Iranian leaders have been killed in the strikes - and Iran is currently focusing its diplomatic efforts on appeals to the United Nations Security Council, where it has labelled Israel's action an "act of war".

From BBC