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Discover LudwigThe phrase "roughly double" is correct and can be used in written English.
It is commonly used to indicate that something is approximately twice as much as another thing. Example: The number of attendees at the conference was roughly double what we had anticipated, causing us to run out of food.
Exact(58)
It sold for $236,750, roughly double its estimated worth.
This would roughly double what has been spent so far.
China's catching up alone would roughly double world consumption rates.
That could roughly double the number of electric vehicles required.
It pushed through classes of roughly double the normal size.
College students roughly double it during the school year.
The July figure is roughly double the number for January.
Yet Britain's current rate is roughly double this.
Global Services signed contracts for $18.1 billion, which was roughly double the third quarter.
It now attracts about two million viewers an episode, roughly double that of other business programs.
Now there are some 230,000 legal immigrants here, roughly double the number in Hungary.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com