first blood

English

Noun

first blood (uncountable)

1. The winning situation in a duel in which the first one to draw blood from the other wins.
2. The first damage or reverse inflicted on an opponent in a conflict.
   • Rambo - They drew first blood, not me.
     Trautman - Look Johnny, let me come in and get you the hell out of there!
     Rambo - They drew first blood...
     Trautman - Rambo, are you still reading me? Covey leader to Raven! Rambo! Acknowledge! http://www.imdb.com/title/tt0083944/quotes