Blend of accost + coast.
accoast (third-person singular simple present accoasts, present participle accoasting, simple past and past participle accoasted) (obsolete)
- (transitive, intransitive) To lie or sail along the coast or side (of); to accost.
1596, Edmund Spenser, The Faerie Queene:
- […] whether high towering or accoasting low […]