declare war

For example, the Government declared war on cancer some time ago.

We could also get serious and declare war on those people.

"They thought somebody in Washington had declared war or something."

I don't want them to declare war on each other.

It looked like the river had declared war, and won.

It could only be a matter of days now before she declared war.

He is not going to declare an economic war against Iraq.

They have declared war on their people and American opinion.

It was the only country to declare war in 1943.

Only Congress can make such a decision - to declare war.