letter box


Concise Oxford English Dictionary © 2008 Oxford University Press:
letter box
noun
  • 1 Brit. a slot in a door through which mail is delivered.
  • 2 (letterbox) a format for presenting widescreen films on a standard television screen, in which the image fills the width but not the height of the screen.
verb (letterbox) record on to video in letterbox format.
'letter box' also found in these Oxford entries:

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