highwater

[GrokHaw]

the tide when the water is highest

[Tayyaba]

the state of the tide when the water is at its highest

[Mamukcer 0]

Highwater typically refers to the highest level reached by a sea or river. It can also relate to highwater mark which indicates the highest level that water has risen in a particular area. In a different context, highwater pants refer to trousers that are noticeably shorter than the standard length, giving the impression that they have been affected by high water.

[Tjalfdyed 0]

The utmost flow of the tide.