\Dis*coast"\, 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.]
      As far as heaven and earth discoasted lie. --G.
                                               Fletcher.
      To discoast from the plain and simple way of speech.
                                               --Barrow.