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Discover LudwigThe phrase "a blue sky" is correct and commonly used in written English.
It can be used as an adjective phrase to describe the color of the sky, or as a noun phrase to refer to the physical expanse of the sky itself. Example 1 (adjective phrase): The artist painted a beautiful landscape with a blue sky and green fields. Example 2 (noun phrase): The children lay on the grass, staring up at the endless blue sky above them.
Exact(49)
Orange against a blue sky?
Irrigated croplands prosper under a blue sky.
The white of a fresh snow under a blue sky?
Day 2 began at 9 a.m. beneath a blue sky.
Flatness, a blue sky, a soft, unhaunted night.
Gertrude Stein may have written that a rose is a rose is a rose, but is a blue sky a blue sky a blue sky?
Similar(9)
It's one thought that never went beyond a blue-sky conversation among his venture capital colleagues.
Figure 3: Observation of a blue-sky bifurcation in ion energy.
So Neil, are you a blue-sky thinker?
"That has to be done in advance on a blue-sky day," McIntosh said.
Every so often, I write what I call a "blue-sky" article, just for fun.
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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