verb (used without object), colluded, colluding.
to act together through a secret understanding, especially with evil or harmful intent.
to conspire in a fraud.

1515–25; (< Middle French) < Latin collūdere to play together, equivalent to col- col-1 + lūdere to play

colluder, noun
precollude, verb (used without object), precolluded, precolluding. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
collude (kəˈluːd)
(intr) to conspire together, esp in planning a fraud; connive
[C16: from Latin collūdere, literally: to play together, hence, conspire together, from com- together + lūdere to play]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1520s, from L. colludere "act collusively," lit. "to play with" (see collusion). Related: Colluding (early 17c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They will collude and conspire to conceal the truth.
Unfortunately here these two sentences collude in their confusion.
Males collude with their peers as a way of stealing fertile females from
  competing dolphin bands.
But when parents and test prep companies collude to game the system, it's
  business as usual.
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