go to war

declare, begin, or see active service in a war

宣戰，進入戰爭狀態；從軍作戰

go to the wars

(archaic)serve as a soldier

(古)當兵

have been in the wars

(informal)have been hurt or injured

(非正式)受過傷

war clouds

a threatening situation of instability in international relations

戰爭陰云，國際緊張局勢

the war clouds were looming.

國際緊張局勢迫在眉睫。

war of attrition

a prolonged war or period of conflict during which each side seeks to gradually wear out the other by a series of small-scale actions

消耗戰

war of nerves

war of words

a prolonged debate conducted by means of the spoken or printed word

唇槍舌劍

war to end all wars

a war, especially the First World War, regarded as making subsequent wars unnecessary

結束所有戰爭的戰爭（尤指第一次世界大戰）

at war

In an active state of conflict or contention.

處于交戰狀態：處于一種沖突或爭論的活躍狀態