soft mud.-a mixture of snow and water; half-melted snow.-a soft mixture of grease and other materials, used for lubrication.-the refuse grease and fat collected in cooking, especially on shipboard.-a mixture of white lead and lime, with which the bright parts of machines, such as the connecting rods of steamboats, are painted to be preserved from oxidation.-to smear with slush or grease; as, to slush a mast.-to paint with a mixture of white lead and lime.