keep to oneself

keep to oneself idiom
  1. Also, keep oneself to oneself. Shun the company of others, value one's privacy, as in She kept to herself all morning, or, as Doris Lessing put it in In Pursuit of the English (1960): “She keeps herself to herself so much.” [Late 1600s]
  2. Refrain from revealing, hold secret, as in He promised to keep the news to himself. Also see the synonym keep under one's hat.

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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