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Discover LudwigThe phrase "used to mark" is correct and usable in written English
It can be used when describing something that serves as an indicator or a sign for something else.
Example: "The red flag is used to mark the area that is off-limits to visitors."
Alternatives: "employed to indicate" or "utilized to signify"
Exact(60)
Lateral buoys are used to mark channels.
It is used to mark the disjunction between legal requirement and actual behaviour.
Typically used to mark dead trees, it works beautifully on sand.
The word comes from a type of moorland stream used to mark land boundaries.
Little seas of flags, used to mark potential mining areas, sprang up everywhere, he said.
No one is sure when shadows were first used to mark off the passage of time.
A soft lead pencil was used to mark the stripes, which were painted lightest colors first.
They are also used to mark the limits of the fairway in harbours, estuaries, and rivers.
Voters' lists were used to mark Sikh houses and businesses overnight.
Engineered virus may also be used to mark proliferating cells.
Fluorescent dyes have also been used to mark mitochondria.
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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