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wa‧ter‧mark
[countable]
[countable]1TCN a special design put onto paper, especially bank notes, that can only be seen when you hold it up to the light
2 a special mark contained in electronic documents, pictures, music etc that is used to stop people from copying them :
3 the high watermark of a particular process is its most successful time or achievement [= high point]
high watermark
especially American English high watermark of 
Reagan's presidency may prove to have been the high watermark of the US-Israeli alliance.
Reagan's presidency may prove to have been the high watermark of the US-Israeli alliance.4 a line showing the highest or lowest levels of the sea [= tide-mark British English]
