letterbox

/ˈlɛtərˌbɑks/
noun
  1. A box or slot in a door or wall where mail is delivered.
    • I checked the letterbox this morning but there were no letters.
    • The postman slipped the package through the letterbox.
    • They installed a new letterbox with a lock to keep mail safe.
  2. A format for displaying widescreen video on a standard screen, with black bars at the top and bottom.
    • I prefer watching films in letterbox rather than having the sides cut off.
    • The DVD offers both full-screen and letterbox options.
    • The movie was presented in letterbox format to preserve the original wide screen view.
verb
  1. To display a widescreen video with black bars at the top and bottom of a standard screen.
    • The editor chose to letterbox the footage to maintain the original aspect ratio.
    • The streaming service will letterbox older TV shows to fit modern screens.
    • If you don't want the image stretched, you can letterbox the video.
What does "letterbox" mean? | whatsthatwordmean | whatsthatwordmean