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Meaning of overdub

o•ver•dub

Pronunciation: (v.ō"vur-dub'n.ō'vur-dub"), [key]
— v., n. -dubbed, -dub•bing,
—v.i.
  1. to add other recorded sound or music, as a supplementary instrumental or vocal track, to a taped musical track to complete or enhance a recording.
—v.t.
  1. to add (a track or tracks) to a musical recording.
—n.
  1. a recorded segment or layer of instrumental parts, vocalization, or sound effects integrated into a musical recording.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.