Setting aside whether we like or dislike the usage, one thing that I think we can all agree on is that the conscious deliberative analysis of precisely what’s going on when we use literally in this way has proved surprisingly challenging and confusing. And yet** every English speaker knows intuitively how to use the expression and understands what it means**.
It’s a great example of how we all intuitively know the vast majority of the rules of language unconsciously, even though we can’t articulate them. It’s what Steven Pinker was discussing in the excerpt that I posted earlier. I’ll post the key part again, and I’d urge people to buy the whole book, it’s a really entertaining read.
[QUOTE=Steven Pinker in “The Language Instinct” Chapter 12]
What would it take to build a device that could duplicate human language? Obviously you need to build in some kind of rules, but what kind? Prescriptive rules? Imagine trying to build a talking machine by designing it to obey rules like [my snark: use literally only in the “correct” way]…It would just sit there…Prescriptive rules are useless without the much more fundamental rules that create the sentences…the rules of Chapters 4 and 5 [of Pinker’s book]. These rules are never mentioned in style manuals or school grammars because the authors correctly assume that anyone capable of reading the manuals must already have the rules. No one, not even a valley girl, has to be told not to say ‘Apples the eat boy’ or ‘The child seems sleeping’…or the vast, vast majority of the millions of trillions of mathematically possible combinations of words. So, when a scientist considers all the high-tech mental machinery needed to arrange words into ordinary sentences, prescriptive rules are, at best, inconsequential little decorations. The very fact that they have to be drilled shows that they are alien to the natural workings of the language system. One can choose to obsess over prescriptive rules, but they have no more to do with human language that the criteria for judging cats a cat show have to do with mammalian biology…
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The message is, we do not learn language from our schoolteachers. This case of the use of literally makes that abundantly clear. Nobody taught us how to use it, but we all know how.
We learn oral language as children by spontaneous absorption of how other people around us speak. And it’s obviously not just rote copying - anyone with a kid knows that young children are constantly trying (unconsciously, they can’t articulate it) to work out the general rules for how to build sentences. We know that they are seeking general rules because of the kind of mistakes they make when there’s an irregular construction, or when they just don’t yet have enough correct examples to infer the general rule correctly. As parents, how do we help them along? Well, for sure it’s not usually by telling them “the rule is…” because most parents themselves can’t articulate the rules accurately. What we usually do is to state the irregular construction in a sentence, or give the kid a bunch more relevant examples of correct sentences, and then we see the kid’s mind working as it (again, I’ll emphasize unconsciously) updates the impied rule based on the new information.
Thus, even the most illiterate peasant and the greatest literary genius share 99% of these fundamental rules of how to build and understand coherent oral sentences. But, as with most things, we take for granted skills that everyone has. Prescriptivist peevers then obsess about the trivialities of the other 1% of the rules, building self-important fantasies that unless the erudite (i.e. people who agree with their pseudoscientific justification of their opinions) standardize that 1% and impose these externally-derived standards on others, that none of us will be able to communicate clearly and civilization will fall apart.