tidemark

• 潮水或水在物体表面留下的痕迹或线条，指示潮水或水达到的最高或最低水位，如海滩或浴缸上的水痕。

A line or mark left on a surface, such as a beach or a bathtub, indicating the highest or lowest level reached by the tide or water.

1. High-water markB2formal

   A line or mark left on a shore or beach indicating the highest or lowest point reached by the tide.

   潮痕

   • The tidemark on the sand showed where the water had reached.
   • We could see a clear tidemark on the rocks after the storm.
   • The tidemark was unusually high this morning.

   同义词high-water markwatermark

2. Dirt line on skinC1informalbritish

   A line of dirt or grime on a person's skin, especially on the neck, indicating incomplete washing.

   身上的污垢线

   • The child had a tidemark around his neck after playing outside.
   • She noticed a tidemark on her arm after gardening.
   • He scrubbed the tidemark off his skin in the shower.