Definition of high-water mark in English:

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high-water mark

noun

1The level reached by the sea at high tide, or by a lake or river in time of flood.
Example sentences
  • We have to protect that strip of land that is from the high-water mark to the low-water mark.
  • South Africa claims that the border is at the high-water mark on the northern side of the river while Namibia insists it is in the middle of the river.
  • So, in our submission, the mean high-water mark is the average point to which the sea reaches between those times.
1.1A maximum recorded level or value: unemployment and crime both stand at a high-water mark
More example sentences
  • I think he'll be a fine major leaguer, but it's not a sure thing and this could very well be the high-water mark for his value.
  • That's far too long for a high-water mark to stand.
  • Board of Education stands as a high-water mark in the modern civil rights movement.

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Line breaks: high-water mark

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