WordNet
strike a blow
v. affect adversely; "The court ruling struck a blow at the old segregation laws"
Usage examples of "strike a blow".
I want to strike a blow for my son and my Care and my King in this war.
He knew that Entreri's dagger would cut him open long before he could strike a blow of his own.
The monster, meanwhile, believing that Belwar was attempting to strike a blow, stopped its dive exactly as it had planned.
He felt a need to draw his sword, felt a need to deliver vengeance, to finally - after all this time - strike a blow against the Pannion Domin.