1. secretly cooperated with someone, especially to do something illegal or dishonest
Usage: past tense of ‘collude’

Examples

• The two companies colluded to fix prices and eliminate competition.
• Officials colluded with criminals to cover up the scandal.
• The students colluded on the exam by sharing answers.
• Evidence showed that the witnesses had colluded to change their stories.
• The investigation revealed that several executives colluded to hide the financial losses.
• They colluded to manipulate the bidding process in their favor.