bi-fold
adjective [ before noun ] (also bifold) uk/ˈbaɪˌfəʊld/ us/ˈbaɪˌfoʊld/
（门窗）可折叠的
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。
- More examples
- Bi-fold doors are a compromise between hinged doors and sliding doors.
- Bifold windows open to provide an unobstructed view of the outdoors.
- The formal lounge is divided from the adjoining entrance hall by way of bifold doors.