collaborate

verb

Etymology: Back-formation from collaborator, from French collaborateur, or else modeled on French collaborer or directly from Late Latin collabōrātus, past participle of collabōrāre. Displaced native Old English efnwyrċan.

1. To work together with others to achieve a common goal.

   “Let's collaborate on this project, and get it finished faster.”

   “Wikipedia is a website where anyone can collaborate.”

2. To voluntarily cooperate treasonably, as with an enemy occupation force in one's country.

   “If you collaborate with the occupying forces, you will be shot.”