'bloodthirsty' originates from the combination of 'blood' and 'thirsty', where 'blood' refers to the red liquid in the body and 'thirsty' means having a strong desire.

'bloodthirsty' evolved from the Old English word 'blodþyrstig', which combined 'blod' (blood) and 'þyrstig' (thirsty).

Initially, it meant 'having a strong desire for blood', but over time it evolved into its current meaning of 'eager for violence or killing'.