People from the UK, can anyone tell me how the word "bloody" become a curse word?

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it is short for BY OUR LADY, referring to

Mary, mother of Christ

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bloody

O.E. blodig, adj. from blod (see blood). It has been a British intens. swear word since at least 1676. Weekley relates it to the purely intensive use of the cognate Du. bloed, Ger. blut). But perhaps connected with bloods in the slang sense of "rowdy young aristocrats" (see blood) via expressions such as bloody drunk "as drunk as a blood." Partridge reports that it was "respectable" before c.1750, and it was used by Fielding and Swift, but heavily tabooed c.1750-c.1920, perhaps from imagined association with menstruation; Johnson calls it "very vulgar," and OED first edition writes of it, "now constantly in the mouths of the lowest classes, but by respectable people considered 'a horrid word', on par with obscene or profane language." 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 Mary, the drink, is from 1956, named for Mary Tudor, queen of England 1553-58, who earned her epithet for vigorous prosecution of Protestants. The drink earned its, apparently, simply for being red from tomato juice. Bloody Sunday, Jan. 30, 1972, when 13 civilians were killed by British troops at protest in Londonderry, Northern Ireland.

Isn't "bleedin'" even worse?

umm....being cohesive with hell? ->bloody hell?:D