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The phrase "could double" is definitely correct and usable in written English.
You can use it when you want to express an idea or a possibility that something could double in quantity, size, or value. For example, "If the demand keeps increasing, the price could double."
Exact(60)
The number of outlets could double.
In five years, hog numbers could double.
That number could double to six tomorrow.
A move to Paris could double that.
Conflict and warfare could double.
"You could double the ginger".
He could double my rent".
Economic output could double every three months.
Those could double their per-PC profit".
Plenty of women could double that easily.
Those hoods could double as shrouds.
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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