tr.v. in·ter·nal·ized, in·ter·nal·iz·ing, in·ter·nal·iz·es 1. To make internal or cause to become internal.
2. To take in and make an integral part of one's attitudes or beliefs: had internalized the cultural values of the Poles after a year of living in Warsaw.
3. To direct (one's bad feelings or conflicts) inwards, often as a manifestation of depression, anxiety, and social withdrawal.