English Dictionary

declare war

verb

(of a governmental authority) To make a formal pronouncement, or sign a legal document, that initiates a state of war between one nation and another, usually before hostilities begin.

The president decided to declare war on the neighboring country.

意味（1）

(of a governmental authority) To make a formal pronouncement, or sign a legal document, that initiates a state of war between one nation and another, usually before hostilities begin.

Germany declared war on France, who reciprocated, on August 3 [1939], and England declared war on Germany on August 4, when Belgium was already under invasion.

意味（2）

To announce one's intention to fiercely combat or eradicate something.

The governor declared war on poverty.