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Longman Dictionary of Contemporary English
big screen
noun
EXAMPLES FROM CORPUS
▪ Monica is due to hit the big screen in January with the release of Dracula.
▪ Or rediscover the drama of the big screen at one of Brighton's luxury cinemas.
▪ People sit silently, faced forward toward a big screen.
▪ Say your television is a big screen and takes up a good amount of wall space.
▪ The only thing less suited to the big screen would be a movie set in a bomb shelter.
▪ The real Erik died more than 1,000 years ago, but he was recently resurrected on the big screen by Terry Jones.
Wiktionary
big screen

n. A surface upon which films are project, and, by extension, films themselves.

Usage examples of "big screen".

Saying that I've said everything, because you've seen me a thousand times, on the big screen in your neighborhood theater or on the little pay-tv screen in your living room, riding through Cholla cactus and short grass, my famous derby pulled down over my eyes, my famous Colt .