To be understood by; make (someone) understand.
Deaf people sometimes find it hard to get through to strangers.
Some of the students in my reading class understand English so poorly that it is difficult to get through to them.
The doctors have never succeeded in breaking through to Mr. Ames, who is a silent and secretive patient.
The little boy could not get through to his housemother.
When the rich boy's father lost his money, it took a long time for the idea to get through to him that he'd have to work and support himself.