v. i. [ Pref. dis- + coast: cf. It. discostare. ] To depart; to quit the coast (that is, the side or border) of anything; to be separated. [ Obs. ] [ 1913 Webster ]

As far as heaven and earth discoasted lie. G. Fletcher. [ 1913 Webster ]

To discoast from the plain and simple way of speech. Barrow. [ 1913 Webster ]