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Learner's definition of BLOOD  
: the red liquid that flows through the bodies of people and animals
— used to say that a person's ancestors were of a particular kind
— see also blue blood, blue-blooded
: members of a team, company, or organization — usually used in the phrases new blood or young blood

blood and guts

— see 1gut

blood is thicker than water

◊ The saying blood is thicker than water means that a person's family is more important than a person's other relationships or needs.

blood is up

◊ In British English, when you say that someone's blood is up, you mean that someone is angry and wants to fight or argue.

blood on your hands

◊ If someone's blood is on your hands, you are responsible for that person's death.

by blood

: by a relationship that connects two people through their natural parents, grandparents, etc.

draw blood

: to take blood from a person's body for medical reasons
: to cause blood to flow from a person's body — sometimes used figuratively

flesh and blood

— see 1flesh

in cold blood

: in a deliberate way : following a plan

in your blood

◊ If something (such as an ability or activity) is in your blood, it is part of your nature and is often shared by your family members.

make someone's blood boil

: to make someone very angry

make someone's blood curdle

ormake someone's blood run cold
: to cause someone to be very afraid or disgusted

out for blood

◊ If you are out for blood or out for someone's blood, you are very angry and you want to kill someone or to cause someone pain or discomfort.

spill/shed blood

: to kill people violently

sweat blood

: to care a lot about something and work very hard for it

taste blood

: to experience pleasure as a result of defeating an opponent
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