-- Cambridge Idiom Dictionary, 2nd ed.
Commonly however, it is used to mean 'raises or leads the question'.
Whether the common usage is correct or not depends on which side of the descriptive/prescriptive language fence one sits on. (A matter totally off topic)
However, there are many - including myself for a time - who still fight to preserve the original meaning. I stopped doing it when I realized that a) English is a fluid language, and b) some people - again, possibly including myself - simply liked to correct people to show off.
(OK, so 'you' was used as a formal singular for a long time too, but I like my version better)
Those words are used by some English speaking cultures because they are useful.
I wonder of the usage is emergent (independent rediscovery), or a cultural meme transferred from another language?
Another fascinating journey on the good ship Wikipedia.
Of course, I believe I've seen "begs the question" used correctly exactly never, and there's an obvious need for a pithy idiom for "begs for the question to be asked", but we don't really have one.
This once again awakens my suspicions that the English language is an elaborate practical joke. And I say that as a native speaker.
"raises the question".
Educated people saved the word "irony" once, "begs the question" isn't gone yet.
To take one specific example from Alanis, (yes I'm going there), there's something peculiarly funny about "ten thousand spoons when all you need is a knife" in a way that wouldn't be if you had "ten thousand turtles when all you need is a knife". I think we needed a word for "bittersweet happenstance", and people wrongly latched onto "irony".
Which is presumably where the confusion with irony (as a stand-alone word) comes from.
Interestingly enough, the term exists in a literal translation in other languages, too: "Ironie des Schicksals" in German, "ironie du sort" in French, and "ironia della sorte" in Italian.
I'm just going to assume that's intentional irony. Genius.