re·verb 
(rĭ-vûrb) Informal
(rĭ-vûrb) Informal n. (also rēvûrb′)
1. A reverberative effect produced in recorded music by electronic means.
2. A device used for producing this effect.
intr. & tr.v. re·verbed, re·verb·ing, re·verbs
To reverberate or cause to reverberate.