noun
a red liquid that circulates in the arteries and veins of humans and other vertebrate animals, carrying oxygen to and carbon dioxide from the tissues of the body
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The athlete was so dedicated to his training that he would sweat blood to achieve his goals.
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I'm willing to sweat blood to make sure this party is a success.
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I swear I'll sweat blood if it means getting that promotion.
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She was so stressed about the presentation that it felt like she was sweating blood.