"A let alone B." Is A more or less than B?

[halfeye]

For example, which of the following would be correct?

• I can not run, let alone walk.
• I can not walk, let alone run.

My instinct is that "let alone" means "not even this one/simpler thing", so the first sentence is correct.

However, I have seen the expression being used the other way around.

In my view, both can be correct (though your first seems to be a misuse).

In your thread title, it's not a matter of A being more or less than B, it's a matter of B being more extreme than A, so if A is small, B is smaller, but if A is big then B is bigger (also hotter, colder, wetter, dryer etc.).