Strike a blow for/against/at something Definition 1 of 3Pro Tip 1/3Figurative Action The phrase often symbolizes taking action towards change, rather than literal physical action. Her speech struck a blow for women's rights. Pro Tip 2/3Conceptual Cause Typically used in the context of social, political, or ethical issues and causes. They hope their campaign will strike a blow for clean energy. Pro Tip 3/3Positive or Negative Can express support ('for') OR opposition ('against'), depending on the cause or the idea. Activists struck a blow against the new policy.