high-water line

variants: or high-water mark

Definition of high-water line

1a : the line of the shore of the sea or of a lake or river to which the waters usually reach at high water:
(1) : the line that marks the limit of the rise of the medium tides of the sea between the spring and neap tides
(2) : the line that marks the limit of the soil so affected by the water of a lake or river as to have a nature and vegetation distinct from that of the banks
b : a mark showing the highest level reached by a body of water
2 usually high-water mark : the highest point : acme the high-water mark of a girl's social career— Hamilton Basso

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of high-water line

1691, in the meaning defined at sense 1a

Learn More About high-water line

Time Traveler for high-water line

Time Traveler

The first known use of high-water line was in 1691

See more words from the same year

Dictionary Entries Near high-water line

high water

high-water line

high-water mark

See More Nearby Entries 

Statistics for high-water line

Cite this Entry

“High-water line.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/high-water%20line. Accessed 21 Jan. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!