If you feel anger, pain, fear or hurt but never show it, you internalize it — you keep it inside.

If you think about the prefix inter- which always indicated something within, you have the meaning of the adjective internalize, "to keep or take something in." It can be used in either a positive or negative way. If you are a debater who internalizes a topic, then you know it inside and out. On the other hand, you're not doing yourself any favors if you internalize your guilt.

Definitions of internalize
  1. verb
    incorporate within oneself; make subjective or personal
    internalize a belief”
    synonyms: interiorise, interiorize, internalise
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    type of:
    ascribe, assign, attribute, impute
    attribute or credit to
Word Family

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