The term "debug" is actually a programming term meaning "to hunt for and remove programming errors".
Any reference you see to "debug" in Calibre will turn on features within Calibre to make debugging easier for the programmers (i.e. it will turn on features that show the programmers what is happening within the program so they can more easily hunt down programming errors).
Unless you're a programmer it probably isn't of much use to you, so I'd advise against turning it on.
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