Verb

1. conspire, cabal, complot, conjure, machinate, plot

usage: engage in plotting or enter into a conspiracy, swear together; "They conspired to overthrow the government"

2. conspire, collude, interact

usage: act in unison or agreement and in secret towards a deceitful or illegal purpose; "The two companies conspired to cause the value of the stock to fall"

See also: conspire (Dictionary)