Lewis & Short

rĕ-tūro, āre, v. a. [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.