undo, v.tr.1Cuirim ar ceal, millim (scéim). To undo the mischief, an dochar a leigheas, a chur ar neamhní. If I could undo the past, dá mbeadh breith ar m'aithreachas agam. 2Scaoilim (ceangal, gruaig). To undo one's dress, do ghúna a oscailt. 3Creachaim (duine), cuirim (duine) ó rath.