full of oneself

full of oneself idiom
Conceited, self-centered, as in Ever since she won the prize Mary's been so full of herself that no one wants to talk to her. This expression uses full of in the sense of “engrossed with” or “absorbed with,” a usage dating from about 1600.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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