voice-over
From Longman Dictionary of Contemporary EnglishRelated topics: Television & radiovoice-overˈvoice-over noun [countable] AMTinformation or remarks that are spoken on a television programme or film by someone who is not seen on the screenExamples from the Corpusvoice-over• The death of a giant, -intones a voice-over.• The ad is thought to follow the theme of past press advertising, with a celebrity voice-over.• Two disc jockeys would compete with each other in the clubs, taking turns to do their voice-over on the discs.