Lewis Short
(verb) : rĕ-tūro, āre, turo, whence also obturo
* To open, unstop (only in the two foll. passages): obscenis verbis novae nuptae aures returare, Varr. ap. Non. 167, 6: ora coarticulare mutorum, surdorum auriculas returare,Arn. 1, 31.
Charlton T. Lewis, Charles Short, A Latin Dictionary