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- conspire
conspire
conspire against (something or someone)
To join together in force or combine in such a way as to foil or defeat someone or something. The wind and rain conspired against our plans for an outdoor barbecue. His two younger brothers conspired against him to have him removed from the head of the company.
conspire with someone (against someone or something)
and conspire (with someone) against someone or somethingto join with someone in a plot against someone or something else. The CEO conspired with the board of directors against the stockholders. Ed conspired with Sam against the plan.