What does "blood" mean?

See blood in WNW Idioms

bad blood

anger; hatred

blood is thicker than water

family ties are stronger than others

have someone's blood on one's head

to be responsible for someone's death or misfortune

in cold blood

  1. with cruelty; unfeelingly
  2. dispassionately; deliberately

make one's blood boil

to make one angry or resentful

make one's blood run cold

to frighten or terrify one

See blood in American Heritage Dictionary 4 Idioms

bad blood

Long-standing animosity.

in cold blood

Deliberately, coldly, and dispassionately.

in (one's) blood

So characteristic as to seem inherited or passed down by family tradition.

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