round out

round out idiom
  1. See round off, def. 2.
  2. Grow or develop to a round form, as in The tree was spindly when first planted, but it has since rounded out nicely. [c. 1900]

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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