used to describe a door or window that has two or more sections and opens by folding each section flat against the next

Wide bi-fold doors open up the back of the house to the garden. 宽大的折叠门让房子的后部通向花园。

Bi-fold windows consist of a series of hinged and framed panels that can be slid back and neatly stacked against the wall. 折叠窗由一系列铰链和玻璃框组成，可以向后滑动并整齐地折靠在墙边。