Slush \Slush\ (sl[u^]sh), v. t. [imp. & p. p. {Slushed}; p. pr. & vb. n. {Slushing}.] 1. To smear with slush or grease; as, to slush a mast. [1913 Webster] 2. To paint with a mixture of white lead and lime. [1913 Webster]