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"have a brainwave" is correct and usable in written English.
It can be used to describe a moment of sudden inspiration or insight. For example: "Suddenly, I had a brainwave and realized I had the perfect solution to the problem."
Exact(4)
But, suddenly, I have a brainwave.
A glance out of the window and someone very important would have a brainwave.
Only 76 years after opening, McDonald's have a brainwave: that it may, perhaps, be a nice idea to make burgers out of patties that aren't so solidly frozen into a meaty tower of babel that it requires McWorkers to smash them against a hard surface to separate them out before grilling (I speak from personal experience).
It's so intuitive, so fun, and it works so well that people instantly have a brainwave one way or the other.
Similar(56)
Once we have a brainwave-powered Netflix machine, we're pretty sure civilization will grind to a halt but until then, we're more than happy to play around with :vtol:'s magnetic brainwave-powered pool.
Then I had a brainwave.
Janouch then had a brainwave.
But this year I had a brainwave!
But then I had a brainwave.
As she walked, she had a brainwave.
And then I had a brainwave.
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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