The Collaborative International Dictionary of English v.0.48:

Accoast \Ac*coast"\ ([a^]k*k[=o]st"), v. t. & i. [See Accost,
   Coast.]
   To lie or sail along the coast or side of; to accost. [Obs.]
   [1913 Webster]

         Whether high towering or accoasting low. --Spenser.
   [1913 Webster]