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Discover LudwigThe phrase "water line" is correct and commonly used in written English.
It refers to a line or mark indicating the level to which water has risen or is expected to rise, or a boundary or limit related to water. Example: During the heavy rainfall, the water line on the river's shore rose significantly, causing concerns for potential flooding.
Dictionary
water line
noun
The outline of a horizontal section of a vessel, as when floating in the water.
synonyms
Exact(59)
Plans for a water line were drawn.
The water line was at least six feet high.
Now the action was below the water line.
Liquid soap was dispensed directly into the shower's water line.
And the city's economy was listing toward the water line.
But for a week, the water line has been rising.
The search continued overnight on sections above the water line.
"Who'd have thought?" he said, pointing to a four-foot water line on the outside of his door, and a one-foot water line just inside.
He also said the sewer and water line upgrades were worth $3 million to the city.
He rips a greeny-white oozing pustule from the wall just above the water line.
But the plane had severed the water line to the upper floors.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com