/ kəˈluːʒn; NAmE / noun
[ U ] ( formal , disapproving ) secret agreement especially in order to do sth dishonest or to trick people :
The police were corrupt and were operating in collusion with the drug dealers.
There was collusion between the two witnesses (= they gave the same false evidence) .
► col·lu·sive / kəˈluːsɪv; NAmE / adjective
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WORD ORIGIN
late Middle English : from Latin collusio(n-) , from colludere have a secret agreement, from col- together + ludere to play.