strike a blow for
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strike a blow for (something)
To do something that helps something or contributes to its success. Relief agencies are desperately hoping that the ceasefire strikes a blow for peace in the region.
strike a blow for (or against) act in support of (or opposition to)
strike a blow for/against/at something act forcefully in support of/against something (for example a belief, principle or group of people): The protest was a chance to strike a blow for freedom. ♢ The new law would strike a blow against racism.