Collaborate (verb)

1. Work jointly on an activity or project.
2. Cooperate with an enemy, especially with an occupying force.

Origin:

Late 19th century: from latin collaborare, from col- "together" + laborare "to work".

Examples:

1. The two companies collaborated on the development of a new product.
2. The scientist collaborated with his colleagues to publish a paper on their research.
3. The artist collaborated with the architect to design a unique building.
4. During the war, some people were accused of collaborating with the enemy.
5. The musician collaborated with the orchestra to create a new piece of music.