"collaborating" in the verb sense
1. collaborate, join forces, cooperate, get together
work together on a common enterprise of project
"The soprano and the pianist did not get together very well"
"We joined forces with another research group"
2. collaborate
cooperate as a traitor
"he collaborated with the Nazis when they occupied Paris"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License