perform an accompaniment to
"The orchestra could barely follow the frequent pitch changes of the soprano"
be a companion to somebody
"She decided to accompany her friend on the hiking trip."
To go with or attend as a companion or associate; to keep company with; to go along with.
"She decided to accompany her friend on the hiking trip through the mountains."
In plain English: To accompany someone means to go with them as their partner or support while they do something else.
"She decided to accompany her friend on their weekend trip."
Usage: Use accompany when you mean going somewhere together, such as accompanying your child to school. Do not confuse it with "accompanying music," which describes playing an instrument while someone else sings rather than physically traveling with them.
The word "accompany" comes from the Old French verb accompagner, meaning "to associate with." This term was originally derived from compaignon, which means "companion."