The onset of the taboo against bloody coincides with the increase in linguistic prudery that presaged the Victorian Era but it is hard to say what the precise cause was in the case of this specific word. Attempts have been made to explain the term's extraordinary shock power by invoking etymology. Theories that derive it from such oaths as "By our Lady" or "God's blood" seem farfetched, however. More likely, the taboo stemmed from the fear that many people have of blood and, in the minds of some, from an association with menstrual bleeding. Whatever, the term was debarred from polite society during the whole of the nineteenth century. [Rawson]
Shaw shocked theatergoers when he put it in the mouth of Eliza Doolittle in "Pygmalion" (1914), and for a time the word was known euphemistically as "the Shavian adjective." It was avoided in print as late as 1936. Bloody Sunday, Jan. 30, 1972, when 13 civilians were killed by British troops at protest in Londonderry, Northern Ireland.从表面上看，bloody是个简单不过的词，古英语作blodig，一般也只是单纯地将它视为blood（血）的派生词，blood加后缀包-y所构成，但若追溯一下其历史我们就会发现这是个与众不同的词。英语词典编纂者帕特里奇(Eric Patridge，1894 - 1979)曾撰文对bloody作了专门论述，该文长达2000字。从18世纪初以来很长一段时间内，bloody用来加强语气，表示“很”或“非常”一义时，在英国一直被列为禁忌语。肖伯纳的名剧《皮格梅隆》（Pygmalion）仅因剧中用了bloody 一词，1912年在伦敦首演时竟然引起巨大轰动。据报道，当女主角卖花女Liza说出“Not bloody likely”（不大可能）一语，全场观众无不震惊。在出现该语的一幕戏中，观众发现自己很难把注意力集中到剧情上，而是全神贯注地等待着那句令人惊愕的话吐自一位女士之口。英国人之所以不愿说出或不愿听到bloody 一词，是因为有人往往把它与menstruation（月经）相联系，也有人往往把它与Christ's blood（天哪）或由God's blood缩略而成的诅咒语’sblood（该死）等相联系，还有人认为它来自by our Lady（圣母啊）一语。最简单的解释是，许多人怕血，长期以来血一直是暴力和死亡的象征。不管怎么说，bloody会使人产生污秽、亵渎等不好的联想。然而bloody在美国英语则一向是个无关痛痒的词。随着时间的推移，如今英国人虽然对bloody已不那么忌讳了，但是有身份的人在某些场合，如男女都在的场合，仍然避而不用。
该词的英语词源请访问趣词词源英文版：bloody 词源，bloody 含义。
来源于日耳曼语blotham(血)。
词根词缀： blood血(液) + -y形容词词尾
同源词：bleed, bless, blood