the fluid that circulates in the principal vascular system of human beings and other vertebrates, in humans consisting of plasma in which the red blood cells, white blood cells, and platelets are suspended.

the vital principle; life

The excitement had got into the very blood of the nation.

a person or group regarded as a source of energy, vitality, or vigor

It's time we got some new blood in this company.

one of the four elemental bodily humors of medieval physiology, regarded as causing cheerfulness.

bloodshed; gore; slaughter; murder

to avenge the blood of his father.

the juice or sap of plants

the blood of the grape.

temperament; state of mind

a person of hot blood.

physical nature of human beings

the frailty of our blood.

Chiefly British . a high-spirited dandy; an adventuresome youth

the young bloods of Cambridge.

a profligate or rake.

physical and cultural extraction

It was a trait that seemed to be in their blood.

royal extraction

a prince of the blood.

descent from a common ancestor; ancestry; lineage

related by blood.

recorded and respected ancestry; purebred breeding.

Slang . a black person, esp. a man.

Hunting . to give (hounds) a first sight or taste of blood. Compare flesh ( def. 14 ) .

to stain with blood. ?

get or have one's blood up

to become or be enraged or impassioned

Injustice of any sort always gets my blood up.

have someone's blood on one's head or hands

to be to blame for someone's affliction or death

Though a criminal, he had no blood on his hands.

in cold blood

deliberately; ruthlessly

The dictator, in cold blood, ordered the execution of all his political enemies.

make one's blood boil, to inspire resentment, anger

or indignation

Such carelessness makes my blood boil.

make one's blood run cold

to fill with terror; frighten

The dark, deserted street in that unfamiliar neighborhood made her blood run cold.

sweat blood. sweat ( def. 37 ) .

taste blood, to experience a new sensation, usually a violent or destructive one

and acquire an appetite for it

Once the team had tasted blood, there was no preventing them from winning by a wide margin.