I. ˈō-vər-ˌdəb noun
Date: circa 1965
1. : the act or an instance of overdubbing
2. : recorded sound that is overdubbed
vocal overdub s
II. ˌō-vər-ˈdəb transitive verb
Date: 1967
: to transfer (recorded sound) onto a recording that bears sound recorded earlier in order to produce a combined effect