Usage Note
Collaborer means to work together on a shared project. However, in a French historical context it also carries the charged meaning of collaborating with the Nazi occupiers during WWII — un collaborateur ('a collaborator') still echoes that sense. In neutral professional contexts, travailler ensemble or coopérer may feel safer.
Examples
"Ils ont collaboré sur ce projet pendant un an."
Natural Translation
They collaborated on that project for a year.

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