scunchArch.Obs.exc.dial.|skʌnʃ| Also 7 scunche, 9 sconce. [Shortened from scuncheon. Cf. squinch.] = scuncheon. 1611Cotgr., Escoinson, a Scunche; the backe part of the iaumbe of a window.1899Dickinson & Prevost Cumbld.Gloss., Scunch, Sconce, Scunchen, the stone or brick reveal of a door or window.