A window with unequal sash, top and bottom.
A cottage window is a double-hung window — i.e., a window with two sashes sliding up and down, hung with one atop the other in the same frame — in which the upper sash is smaller (shorter) than the lower one. The upper sash often contains smaller lights divided by muntins (often known as a "divided light pattern" or "grille"), although in some cases both sashes may be divided.
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