collude

[kuh-lood]
verb (used without object), colluded, colluding.
1.
to act together through a secret understanding, especially with evil or harmful intent.
2.
to conspire in a fraud.

Origin:
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.
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World English Dictionary
collude (kəˈluːd)
 
vb
(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]
 
col'luder
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

collude
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.
Synonyms
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