countercampaign

noun
coun·​ter·​cam·​paign | \ ˌkau̇n-tər-(ˌ)kam-ˈpān How to pronounce countercampaign (audio) \
variants: or counter-campaign
plural countercampaigns or counter-campaigns

Definition of countercampaign

: a campaign waged in opposition to another campaign Conservatives slammed the law, claiming it discriminates against men and waged a counter-campaign.— Anna Momigliano

First Known Use of countercampaign

1881, in the meaning defined above

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