The word ‘collusion’ has its roots in Latin. The Latin prefix col-, meaning “together,” and the verb ludere, “to play,” come together to form collude. The related noun collude has the specific meaning “secret agreement or cooperation.” (Mirriam Webster dictionary). The Collins dictionary defines collusion as “to act together through a secret understanding, esp. with evil or harmful intent”.
On the face of it, it seems clear that there would need to be a conversation of sorts to reach an agreement to cooperate. The question that is plaguing me however is whether the need for a verbal conversation or written agreement is necessary to enter a collusion. Could you have two or more players playing together without any meeting, secret or not, and without a verbal or written agreement to cooperate?