root out
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Search for, seek to discover, as in He was trying to root out the reason for her long absence. This idiom alludes to the way hogs dig by using their snouts. [Mid-1800s]
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American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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