'blood' originates from Old English, specifically the word 'blōd', where the Proto-Germanic form '*blōþą' meant 'blood (the bodily fluid)'.

'blood' changed from Old English 'blōd' into Middle English 'blood' and eventually became the modern English word 'blood'.

Initially, it meant 'the red fluid in the body'; over time the primary physical meaning has remained, while figurative senses (kinship, lineage, anger, or group names) developed.