"conspire" in the verb sense
1. conspire, cabal, complot, conjure, machinate
engage in plotting or enter into a conspiracy, swear together
"They conspired to overthrow the government"
2. conspire, collude
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"
Source: WordNet® (An amazing lexical database of English)
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