1. worked together with others on a project or activity
Usage: past tense of collaborate
2. cooperated with an enemy, especially during wartime occupation
Usage: often carries negative connotations

Examples

• The scientists collaborated on groundbreaking research.
• She collaborated with her classmates on the group project.
• The two companies collaborated to develop new technology.
• Musicians from different countries collaborated on the album.
• During the war, some citizens collaborated with the occupying forces.
• The authors collaborated to write the bestselling novel.