1) Centerfold 2) Centrefold 3) Gatefold 1) Gatefold 2) Hidden bed 3) Like some couches 4) Page 
[n] - an oversize page that is folded in to a book or magazine
gatefold noun an oversize page that is folded in to a book or magazine
a page larger than the trim size of a magazine or book, folded one or more times so as not to extend beyond the pages; gatefold.