collaborate
1. [ verb ] (work) work together on a common enterprise of project
Synonyms: cooperate join_forces get_together
Examples:

"The soprano and the pianist did not get together very well" "We joined forces with another research group"

Related terms: work play_along collaborator collaboration
2. [ verb ] (work) cooperate as a traitor
Examples:

"he collaborated with the Nazis when they occupied Paris"

Related terms: collaboration
Similar spelling:   collaborative
  collaborator
  collaboration
  Colubrina
  Colubridae
  colubrid
  Colbert_butter