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1. Another name or identity that one assumes. He's a clean-cut accountant during the week, but on the weekend he indulges in hedonistic pursuits as his alter ego "Jack."
2. A separate or different aspect or element of one's personality, identity, or psyche. For such a quiet woman, she has a rage and temper at times that is like some alter ego.
3. A close, inseparable friend of very similar attitudes and interests. My girlfriend and I are so similar, we are like each other's alter ego.
4. A person who acts as a substitute for or copy of another person; a doppelgänger. Due to his increasingly failing health, the dictator's son has been running the country for the past month, essentially as his alter ego.
stroke someone's ego
Fig. to flatter and praise someone. If you have trouble with him, just take a few minutes and stroke his ego. You'll soon have him eating out of your hand.
an ego trip
something that you do in order to make yourself feel important Running the university Film Society is a big ego trip for her.
Behavior or activities undertaken mainly out of vanity or for self-gratification. For example, She's really on an ego trip, trying out for the lead. [1960s]
n. a public expression of one’s feelings of importance or superiority. The guy is on another ego trip. Pay no attention.
n. a person who habitually goes on an ego trip. Not another ego tripper running for public office!