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Meaning of tidemark

tide•mark

Pronunciation: (tīd'märk"), [key]
— n.
  1. the point that something or someone has reached, receded below, or risen above: He has reached the tidemark of his prosperity.
  2. a mark left by the highest or lowest point of a tide.
  3. a mark made to indicate the highest or lowest point of a tide.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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