draw first blood
To be the first to gain an advantage or score against an opponent. I drew first blood in the tournament and quickly dispatched my opponent.
draw first blood
JOURNALISMIf someone draws first blood in a game or conflict, they are the first to score or succeed. The Scots drew first blood with a drop goal from Gregor Townsend. Note: You can also say first blood to someone. Then came the John Hopoate mistake that ensured first blood to England.