(shutter) a mechanical device on a camera that opens and closes to control the time of a photographic exposure
(shutter) a hinged blind for a window
Close (a business)
(shutter) close with shutters; "We shuttered the window to keep the house cool"
Close the shutters of (a window or building)
Two shutters that are hinged together, usually with a butt hinge
a door that folds in the middle, usually having one end in a fixed position while the other runs along a guide track.
Double or twofold
This type of sofa-bed futon folds a single time along its length, and its frame has two slat racks to support the mattress. It is the most common type of futon and can be found in full, queen, loveseat as well as chair sizes.
12.22.07 j
Master bedroom shutters in silhouette (bifold being demonstrated)