1. a person who works jointly with others on an activity or project
2. a person who cooperates traitorously with an enemy
Usage: often derogatory

Examples

• The scientist worked with several collaborators on the research project.
• She found a talented collaborator for her new business venture.
• The authors thanked their collaborators in the acknowledgments section.
• The documentary featured interviews with the artist’s longtime collaborators.
• During the war, suspected collaborators faced harsh punishment.
• The resistance movement targeted known collaborators with the occupying forces.