I saw this in one book: Her cheeks were too big and outrageously red-red to bear looking at. What does red-red mean here? Where can I read more on this particular hyphen rule?
They may have been referring to each cheek, the two being red-red, though one wonders if anyone has dissimilar cheeks.
It looks like they may be emphasizing the second half of the sentence. They were real red. In fact too red to look at.
But I'll agree they were just amplifying the redness. Not just red but way red, in fact red-red.