"under the bed" is correct and usable in written English. You can use it to refer to items that might be stored or hidden in the space under a bed. For example, "I found my lost necklace under the bed."
The Crocodile Under The Bed came about because my children used to think there might be something under the bed.
He's under the bed.
And under the bed.
Shoebox under the bed?
Nor were they under the bed.
Glover said she was under the bed.
"Check under the bed for Bartmans".
Are you an under-the-bed kind of spider?
Purchase bed raisers for under-the-bed storage.
Under-the-bed storage is really just clutter.
Invest in some under-the-bed storage boxes.
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