colluded; colluding; colludes
Definition of collude
: to work together secretly especially in order to do something illegal or dishonest : conspire, plot
It was arithmetically possible, too, for a handful of senators … to collude with the president to approve a treaty betraying some vital interest to a foreign power.— Jack N. Rakove … the travails of the world's two biggest art-auction businesses, … rivals that now stand accused by the U.S. Justice Department of colluding to rig the auction market by fixing their sales-commission rates.— Robert Hughes … argues that while the kids are not entitled to collective representation, major universities are permitted to collude to prevent players from being paid for their work.— David Sirota
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Merriam-Webster unabridged
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Time Traveler for collude
The first known use of collude was in 1525
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