bifold

A bifold is a type of door, window, shutter, or divider that consists of two equal panels hinged together so that it opens by folding the panels against each other
نوعی در، پنجره، کرکره یا پارتیشن است که از دو پانل مساوی تشکیل شده که با هم لولا شده اند به طوری که با تا کردن صفحات روی یکدیگر باز می شود.
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آکاردئونی
مثال؛
The doors to the left were bifolds and opened into a long living room.
Wood - finished insulative shutters set as bifolds at the window.