Douglas Harper's Etymology Dictionary
Usage examples of "fold-out".
Most engineers were assigned to tiny rooms with fold-down beds, but Hackworth bore the loftier title of Artifex and had been a team leader on this very project, so he rated a second-class stateroom with one double bed and a fold-out for Fiona.
He went to a fold-out cabinet, produced a fifth of scotch which returned only pocket change from your ten when purchased in a cut-rate liquor store, and splashed it over two ice cubes in a pony glass.
The last fold-out page contained a list of the travel agencies that sponsored such a tour.