Work done to oppose, undermine, or undo the effect of other work; sabotage or opposition through action.
From counter- + work. Emerged in industrial and political contexts to describe efforts that deliberately oppose or sabotage others' efforts.
If you're building a sand castle and your sibling keeps knocking it down, that's counterwork—but it also describes more serious situations where people deliberately work to sabotage others' projects or goals.
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