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Discover LudwigThe phrase "Keep watch" is correct and usable in written English
It can be used when instructing someone to remain vigilant or attentive to something.
Example: "As the night fell, the guard was instructed to keep watch over the perimeter."
Alternatives: "Stay alert" or "Be on guard."
Dictionary
Keep watch
verb
To guard; to watch over someone or something.
Exact(59)
Keep watch that they do not burn.
Keep watch," Sunny orders.
Keep watch.
Keep watch, but don't hover.
Keep watch for other symptoms.
Keep watch face open for best results.
Keep watch to see what's happening.
Keep watch for junkyards as you drive around town.
Keep watch not to darken pecans too much.
Keep watch to ensure they do not burn.
Keep watch of your goals as you play the game.
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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