strike a blow against (something)

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strike a blow against (something)

To do something that contributes to something's defeat or downfall. Health officials are hoping that this latest initiative will be able to strike a blow against the obesity epidemic. Reports surfaced today that, if true, will strike a blow against the nascent campaign.

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.