Meaning of “collude” - Learner’s Dictionary

collude

verb [ I ] us uk /kəˈluːd/ formal

to do something secretly with another person or group, in order to deceive or cheat others:

The company colluded with competitors to fix prices.
collusion noun [ U ] us uk /kəˈluːʒən/

He was accused of being in collusion with the terrorists.

(Definition of “collude” from the Cambridge Learner’s Dictionary © Cambridge University Press)