To collaborate is to work with another person or group in order to do or achieve something. Collaborate can also be used disapprovingly to mean "to cooperate with or willingly assist an enemy of one's country and especially an enemy who occupies it during a war."

// Several research teams from various countries collaborated closely on the project.

// They were suspected of collaborating with enemy forces.

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"Forever 21 collaborated with photographer Henry R. Jones II for the reveal of its Black History Month unisex collection. The 17-piece display delivers deeply personal pieces intimately connected to Jones' artistic journey. Known for his striking photography and poetry, Jones extends a unique invitation to the viewer, allowing them to immerse themselves in the intricate layers of his art." — Kenyatta Victoria, Essence, 1 May 2024

The Latin prefix com-, meaning "with, together, or jointly," is a bit of a chameleon—it has a habit of changing its appearance depending on what it's next to. For example, if the word it precedes begins with l, com- becomes col-. In the case of collaborate, com- teamed up with the verb laborare ("to labor") to form the Late Latin word collaborare ("to labor together"). Be careful not to confuse collaborate with corroborate, another com- relative. This word was formed when com- (this time shape-shifting to cor-) joined forces with the Latin word robur ("strength"). Together, by way of the Latin verb corroborare, they created the meaning "to support or help prove (a statement, theory, etc.) by providing information or evidence," which carried over into the English word corroborate.