COLLUSION, noun s as z.
1. In law, a deceitful agreement or compact between two or more persons, for the one party to bring an action against the other, for some evil purpose, as to defraud a third person of his right.
A secret understanding between two parties, who plead or proceed fraudulently against each other, to the prejudice of a third person.
2. In general, a secret agreement for a fraudulent purpose.