letterbox
英[ˈletəbɒks]
美[ˈletərbɒks]
柯林斯高阶英汉双解学习词典释义
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N-COUNT
（门上的）信件投递孔；（建筑物入口处的）信箱
A letterbox is a rectangular hole in a door or a small box at the entrance to a building into which letters and small parcels are delivered.
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ADJ
（电视或计算机显示）信箱格式的，上下黑边的，宽屏的
If something is displayed on a television or computer screen in letterbox format, it is displayed across the middle of the screen with dark bands at the top and bottom of the screen.