high water
= high tide. ,high-water mark
1 mark showing the highest level reached by the sea or by flood waters 高水位线(标明海水或洪水所达到的最高水位).
2 (fig 比喻) highest point of achievement 成就的顶点.
There has long been a superstition among mariners that porpoises will save drowning men by pushing them to the surface, or protect them from sharks by surrounding them in defensive formation.