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first blood

British  

noun

  1. the first killing or wounding in a fight or war

  2. the first damage or reverse inflicted on an opponent in a conflict

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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The findings suggest that early animals created the first blood cells by reusing genetic material inherited from ancient single-celled ancestors.

From Science Daily May 27, 2026

Pegula swung the momentum her way and drew first blood in the final set, opening up a 4-1 gap with an inch-perfect lob.

From Barron's Feb. 20, 2026

The Springboks drew first blood and, given it was so early, it was a grim beginning for Scotland.

From BBC Nov. 10, 2024

Williams had drawn first blood with a right-footed shot from the center of the box five minutes earlier.

From Los Angeles Times Nov. 11, 2023

The lab in Kinshasa ruined his first blood sample and asked us to send another, so the results on what diseases Otto might have weren’t in yet.

From "Endangered" by Eliot Schrefer

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