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"lay behind" is correct and usable in written English.
You can use it to describe someone or something as being hidden or concealed by something else. For example: A dark secret lay behind her confident facade.
Exact(59)
But steel lay behind it.
But much lay behind it.
What lay behind my tears?
What thoughts lay behind it?
So what lay behind the mask?
But what lay behind Ugandan Asian success?
What hidden agendas lay behind these anxieties?
Nasdaq has already explained what lay behind the problem.
Eight years later, the Army lay behind me.
We believe a similar sentiment lay behind last night's applause.
Of course, some calculation lay behind his position.
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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