Definition of cooperating:
(v) :
(intransitive) To work or act together, especially for a common purpose or benefit.
(v) :
(intransitive) To allow for mutual unobstructed action.
(v) :
(intransitive) To function in harmony, side by side.
(v) :
(intransitive) To engage in economic cooperation.
(v) :
(law jargon, transitive) To obtain the cooperation of (a potential witness); to turn (someone) into a cooperating witness.