din in(to) (someone)
To ingrain something in someone through repetition. A noun or pronoun can be used between "din" and "in(to)." When your mother and I were kids, we learned the multiplication tables because our teacher dinned them into us.
din something into someone
and din something into repeat something over and over to someone. (As if one could "hammer" words into someone.) The teacher dinned it into her constantly, but it did no good. He dinned in the same message over and over.