“被处死”常见的英文表达有 be executed 或 be put to death。
be executed：侧重于指依法对罪犯执行死刑，是一个较为正式、常用的表达。例如：The criminal was executed for his heinous crimes.（这名罪犯因其令人发指的罪行而被处死。）
be put to death：同样表示“被处死”，语义较为直白，在日常和书面语境中均可使用。例如：In some ancient societies, people who committed serious crimes would be put to death.（在一些古代社会，犯下重罪的人会被处死。 ）