Etymology
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sacre bleu (interj.)

an English notion of a stereotypical French oath, 1869, from French sacré bleu, literally "holy blue," a euphemism for sacré Dieu (1768), "holy God." From Old French sacrer, from Latin sacrare "to make or declare sacred" (see sacred). Such things are never idiomatic. In an old French-language comic set in the U.S. Wild West, the angry cowboys say "Bloody Hell!"

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