collude

verb collude

• connive — If one person connives with another to do something, they secretly try to achieve something which will benefit both of them.
• plot — a secret plan or scheme to accomplish some purpose, especially a hostile, unlawful, or evil purpose: a plot to overthrow the government.
• intrigue — to arouse the curiosity or interest of by unusual, new, or otherwise fascinating or compelling qualities; appeal strongly to; captivate: The plan intrigues me, but I wonder if it will work.
• conspire — If two or more people or groups conspire to do something illegal or harmful, they make a secret agreement to do it.
• scheme — a plan, design, or program of action to be followed; project.