The Symbol of Blood in Macbeth Blood is known to all of us to represent life, death and often injury. Blood is an essential part of life, and without blood, we could not live. This is known to everyone, and because of this, when Shakespeare uses the symbol of blood to represent treason, murder and death, it is easily understood and fits in perfectly with the ideas we have of blood. Blood is mentioned often in the play and most times in reference to murder or treason. The first sinister reference to blood is in Act 2, Scene 1, when Macbeth sees the dagger floating in the air leading him to Duncan's room and he sees "on the blade and dudgeon gouts of blood", indicating that the kn