To search for underground water or minerals using a divining rod or similar tool.
From Middle English 'dowse,' possibly from German 'deuten' (to interpret) or related to 'douse.' The practice was called 'dowsing' by the 16th century and remains controversial in modern science.
Despite being dismissed by scientists, dowsing is still used by water companies in some countries—a perfect example of how traditions persist even when we can't explain why they work (or if they work at all).
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