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1. To wound or kill someone violently, often by inflicting wounds in which blood literally spills out of the body. A noun or pronoun can be used between "shed" and "blood." The soldier was arrested and court-martialed for shedding blood in the village near the military encampment. I will not rest until I find who is responsible for shedding these people's blood.
2. To sustain serious (and perhaps fatal) injuries, often wounds in which blood literally spills out of the body. A noun or pronoun can be used between "shed" and "blood." I've never shed blood before, so it made my stomach turn to see it pouring out of me. These brave soldiers shed their blood to protect our freedom.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Also, spill blood. Wound or kill someone, especially violently. For example, It was a bitter fight but fortunately no blood was shed, or A great deal of blood has been spilled in this family feud. Both of these terms allude to causing blood to flow and fall on the ground. The first dates from the 1200s. The variant amplifies the verb spill, which from about 1300 to 1600 by itself meant "slay" or "kill"; it was first recorded about 1125.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
shed (someone's) blood
To wound someone or take someone's life, especially with violence.
1. To wound or kill in a violent manner.
2. To be wounded or killed: "For he today that sheds his blood with me / Shall be my brother" (Shakespeare).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.