Declare war
"Declare war" in a Sentence (3 examples)
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.
The governor declared war on poverty.
Leo Lillard, a Nashville native attending Tennessee State University, had become involved in the sit-ins as soon as they started. It was no longer just the students, it was clear that the town had declared war on racism.