The word "封杀" is formed by combining the characters "封" (fēng), meaning to seal or block, and "杀" (shā), meaning to kill or eliminate. Together, they create a compound term where "封" conveys the action of banning or shutting out, and "杀" intensifies this with a sense of eradication or suppression, resulting in the meaning of a forceful boycott or complete prohibition, often in contexts like media or careers.