1. a person who secretly cooperates with another to achieve a dishonest or illegal purpose
Usage: countable noun; typically used in legal or formal contexts

Examples

• The investigators identified the colluder who had helped the executive hide the company's financial losses.
• She was accused of being a colluder in the fraud scheme.
• The colluders worked together to manipulate the election results.
• Without a colluder on the inside, the theft would not have been possible.
• The court found that both the manager and the accountant were colluders in the embezzlement.
• He refused to become a colluder in his colleague's unethical plan.