ACCOST Meaning of ACCOST in English ■ verb approach and address boldly or aggressively.OriginC16 (orig. in the sense 'lie or go alongside'): from Fr. ~er , from Ital. ~are , from L. ad- 'to' + costa 'rib, side'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004