Tidemark

noun

Definitions

Noun
  1. 1
    a line (of seaweed or differently coloured sand etc) on the shore showing the level of high or low tide
  2. 2
    indicator consisting of a line at the highwater or low-water limits of the tides wordnet
  3. 3
    any mark showing the limit of some past activity broadly
  4. 4
    a line of scum left on a bath tub when the water is drained away humorous

Etymology

From tide + mark.

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