CAPSIZE Meaning of CAPSIZE in English ■ verb (of a boat) be overturned in the water.OriginC18: perh. based on Sp. capuzar 'sink a ship by the head', from cabo 'head' + chapuzar 'to dive or duck'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004