Definition of "letterboxes" [letterboxes]

• Plural form of letterbox. (noun)

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• "If you have an SDTV, then more often than not, widescreen shows will add those black bars ( "letterboxes") that misinformed children seem to love to complain about."
• "Imperial and sometimes American opportunity meant that envelopes with collectable stamps came through the letterboxes of many ordinary homes."
• "Slavic and Turkish surnames appear on the letterboxes in roughly equal proportion with German ones."