off-screen
US /ˌɑːfˈskriːn/
UK /ˌɑːfˈskriːn/
1.
not visible on a screen, but still part of the action or story
:
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The director decided to keep the monster off-screen for most of the movie to build suspense.
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We heard a loud crash off-screen, indicating something had fallen.
1.
in a location not visible on a screen
:
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The narrator's voice came from off-screen.
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The action continued off-screen, leaving the audience to imagine the details.