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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 (one)
To plot or scheme with one. What are you kids whispering about back there? You better not be conspiring with each other! The president of the company conspired with his assistant to conceal all evidence of his crime.
conspire with (someone) against (something or someone)
To join together in force or combine in such a way as to foil or defeat someone or something. I bet the CEO conspired with the head of HR against Tom. Why else would he have been removed from the company like that?
conspire with someone (against someone or something)and conspire (with someone) against someone or something
to 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.