accompany

Where it comes from

Accompany came from Old French acompaignier, to take as a companion, based on compaign, companion. Companion descends from Late Latin companio, a bread fellow or messmate, from com-, with, and panis, bread.

How the meaning developed

Sharing bread named a person in one's company. The verb built on that relationship first meant joining or keeping company with someone, then expanded to things occurring together and to music performed alongside another part.

In use

To accompany someone is to go or be present with them.
The word belongs to the family of “companion”.