Related topics: Oceanography, Cleaning
ˈtide-mark noun [countableC] 1. HEOa mark left on the beach by the sea, that shows how high the sea reached 〔潮水在海岸上留下的最高〕潮痕
2. British EnglishBrE informalDHC a dirty mark left around the inside of a bath by the water 〔浴缸里留下的〕垢痕