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the search for or discovery of underground water sources by means of a divining rod.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
The use of a small forked branch of a tree to find underground water, and thus determine water well sites. There is no scientific evidence that water witching actually works.
1001 Words and Phrases You Never Knew You Didn’t Know by W.R. Runyan Copyright © 2011 by W.R. Runyan