Ablative of Accompaniment indicates the person or people who acts in company with or exists in company with the subject.

Latin to English - The preposition cum followed by A PERSON OR PEOPLE in the ablative case indicates accompaniment. It translates as "with A PERSON OR PEOPLE."

English to Latin - To express "with A PERSON OR PEOPLE" in Latin, use the preposition cum, and put A PERSON OR PEOPLE in the ablative case.