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collaborate (verb) work together; help the enemy.
When two or more people work together to achieve something, especially in science or art, they collaborate with one another. When you and another person together write a book, or carry out research, you collaborate with each other in writing the book, or in the research. If a joint venture is set up by two companies, they collaborate in setting it up. 'She is collaborating with him in developing a vaccine for the prevention of AIDS.' This means, they are carrying on research together for developing the vaccine. When two countries act in collaboration, they put up their combined efforts to do something. To help the enemy of one's country, especially when one's country is under the enemy's occupation or attack, is to collaborate with the enemy. When you help the enemy by giving them crucial information about the security of your country, you collaborate with them. So a collaborator is a traitor.
- Medical researchers across the world have been collaborating in finding a cure for cancer, but, unfortunately, their joint efforts have made little progress in finding out even its causes.
- A chance discovery of Jean Paul's diary led the police to investigate his role in the World War II, and they found strong evidence of his having collaborated with the Nazis in finding out Jews who had sought refuge in France.