have blood on one's head

noun

1. the usually red fluid, consisting of plasma, red and white blood cells, etc., that circulates through the heart, arteries, and veins of vertebrates: blood is a body tissue that carries oxygen, hormones, cell-building material, etc. to, and carbon dioxide and waste matter away from, the other body tissues
2. a comparable fluid, usually colorless or bluish, in many invertebrate animals
3. the spilling of blood; murder
4. lifeblood
5. the sap or juice of a plant
6. passion, temperament, or disposition
7. parental heritage; family line; lineage
8. relationship by descent in the same family line; kinship
9. descent from nobility or royalty
10. descent from purebred stock
11. a dandy or fop
12. people, esp. youthful people: new blood in an organization
13. ☆ Slang
    1. a black person, esp. a male
    2. a close male friend: used, often in direct address, esp. among black people

transitive verb

1. to let (a hunting dog) taste, smell, or see the blood of its prey
2. to initiate (a hunter) by staining the hunter's face with blood of the prey
3. to initiate (a person) in any new experience