To think or talk about yourself excessively, or to make something all about your own interests and desires.
From ego (Latin for 'I') plus the suffix -ize (meaning 'to make' or 'to become'). The term emerged in the 19th century as psychology and philosophy began examining self-centered behavior more systematically.
Egoize is like the verb form of what happens when someone can't stop making everything about themselves—it's the action version of ego, and it became popular right around the time Freud was revolutionizing how we think about the self.
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