To familiarize someone with something. You need to accustom the new interns to the layout of the building.Seth will accustom you to this project before our next meeting.Accustom yourself to the new software before we start using it more frequently.
To bring someone or something into a condition that is harmonious with something else, especially through repeated experience: I have accustomed myself to waking up at dawn. They are not accustomed to such formal clothing.