term collaborate dates from 1871, and is a back-formation from collaborator (1802), from the French collaborateur. It was used during the Napoleonic Wars against smugglers trading with England and assisting in the escape of monarchists. It is derived from the Latin collaboratus, past participle of collaborare "work with", from com- "with" + labore "to work".

The meaning of "traitorous cooperation with the enemy" dates