The third-person singular present tense of collaborate, meaning to work together with someone else toward a common goal or project.
From Latin 'collaborare' (com- 'together' + laborare 'to work'), entering English in the 17th century initially with neutral meaning, later gaining negative connotations during WWII.
The word 'collaborator' became a term of shame during World War II for people working with occupying forces, showing how the same word can flip from positive to deeply negative based on historical context.
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