1A mark left or reached by the sea on a shore at the highest point of a tide.
潮痕，潮标（海潮达到的最高点）
Example sentencesExamples
When a high tide occurs and the tidemark reaches beyond the normal beach line, this tends to create certain element of fear in the people.
I have seen them feeding at the tidemark with snow buntings and pipits and they also find seeds in the marram hills.
It was, I felt, scenically enhanced by its proximity to the Dodder River, even though it was the cause of the water tidemarks on the internal walls, the area having flooded a few years back.
In a review article, he concluded that physical factors were most important to determine the upper and lower limits of intertidal communities, but biological factors predominated in life between the tidemarks.
1.1British informal A grimy mark left on a surface, especially around the inside of a bath or washbasin, at the level reached by water.
〈英〉（尤指浴缸、脸盆的）水（垢）痕
the basin was ringed by a tidemark composed of specks of hair and shaving cream
Example sentencesExamples
Check that the tea/coffee tidemark is being rubbed off.
In any case, I am far too busy breaking up concrete in my backyard and repainting the growing tidemark on my ceiling where the air-conditioner leaked.
‘There was no tidemark - just a few signs of damp because the dehumidifiers are still taking out two gallons a day,’ he added.
I still have the clay tidemarks on my shoes (having worn them not my walking boots, as my walking boots are in a box somewhere).
I wash my dishes weekly, bath tidemarks don't distract me.
It rises up to the narrow tidemark and with a swift flick of his wrists, it squeaks to a stop.
Definition of tidemark in US English:
tidemark
nounˈtīdˌmärkˈtaɪdˌmɑrk
A mark left or reached by the sea on a shore at the highest or lowest point of a tide.
潮痕，潮标（海潮达到的最高点）
Example sentencesExamples
In a review article, he concluded that physical factors were most important to determine the upper and lower limits of intertidal communities, but biological factors predominated in life between the tidemarks.
I have seen them feeding at the tidemark with snow buntings and pipits and they also find seeds in the marram hills.
It was, I felt, scenically enhanced by its proximity to the Dodder River, even though it was the cause of the water tidemarks on the internal walls, the area having flooded a few years back.
When a high tide occurs and the tidemark reaches beyond the normal beach line, this tends to create certain element of fear in the people.