An internalize is when you take an idea or message and make it your own, like really understanding something.
When we talk about internalizing, we often mean making something inside of yourself. This can happen with messages from others, whether they're encouraging words from a friend or a rule learned in school. For example, if someone says, "You're smart enough to do this," you might start believing it and feeling more confident as a result. You've internalized their message because now it's part of how you see yourself.
(transitive) To make something internal; to incorporate it in oneself.
