To remove a soundtrack, dubbing, or voice-over from a film or recording; to undo dubbing work.
From dis- (reverse/remove) + dub (from double, meaning to add a new soundtrack). Emerged in film and audio production as a technical term for undoing post-production work.
Film restorers sometimes have to disdub old movies to recover original dialogue buried under decades of poor-quality overdubs—it's detective work because the original recordings might be on deteriorating tape from the 1950s.
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