be oneself

be oneself idiom
  1. Act in one's usual fashion; be in one's normal physical or mental state. For example, Peter's finally recovered from the accident and is himself again, or I was completely distracted; I just wasn't myself.
  2. Act without pretense; be unaffected, sincere. For example, I really enjoy their company because I can be myself with them.

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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