COLLABORATE
collaborate, join forces, cooperate, get together
(verb) 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”
collaborate
(verb) cooperate as a traitor; “he collaborated with the Nazis when they occupied Paris”
Source: WordNet® 3.1
Etymology
Verb
collaborate (third-person singular simple present collaborates, present participle collaborating, simple past and past participle collaborated)
To work together with others to achieve a common goal.
To voluntarily cooperate treasonably, as with an enemy occupation force in one's country.
Source: Wiktionary