The word "遮住" is a verb formed through a common Chinese grammatical structure known as a verb-resultative complement, where the first character "遮" (zhē) is the primary action verb meaning "to cover" or "to conceal", and the second character "住" (zhù) functions as a complement indicating a successful or fixed result, in this case, "to stay" or "to be held in place". Thus, the combined term "遮住" literally means "to cover and make stay", evolving semantically to express the complete action of "to cover up", "to block from view", or "to obscure something successfully".