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Traditionally a blood oath was when one would shed their own blood(Cut yourself or something) and offer it onto a altar or whatever they believed right(sometimes a religious action) and swore to uphold a certain task, no matter what. Also it was when a person(s) would shed blood, usually they'd cut their hand and then shake hands in agreement to a task they swear to uphold. More modernly it just means you swear to do something no matter what, and since it's a blood oath, modernly it means hurting or even killing others in oath, thus 'blood' oath, meaning blood would be shed in promise to the task, usually a phrase only used by mobsters and crooks.
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