Describing a door, window, or panel that folds in the middle or has two sections that fold together, commonly used for closet doors and glass dividers.
From 'bi-' (two) and 'fold,' literally describing something that folds in two directions or has two fold lines.
Bifold doors represent a clever solution to space problems—instead of swinging out and taking up room, they fold back against themselves, which is why they became standard in small apartments and closets everywhere.
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