witness post
 n.— «Sara Yurman, 33, is a geographer with the Gwinnett County planning department who specializes in mapmaking. She found a “witness post” in the Modoc community, a rare thing, so she said, that showed that Modoc sits 5 feet above sea level.» —“Cyclists head home to BRAG again with growing event” by Jim Galloway Atlanta Journal Constitution (Georgia) June 20, 1988. (source: Double-Tongued Dictionary)

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