'blood-filled' originates from English, a compound of the noun 'blood' and the past-participial adjective 'filled', where 'blood' referred to the bodily fluid and 'filled' meant 'made full'.

'blood' comes from Old English 'blōd' (from Proto-Germanic *blotham), and 'fill' comes from Old English 'fyllan'; the compound 'blood-filled' formed in Modern English by combining these elements to describe something full of blood.

Initially the separate elements meant 'bodily fluid' ('blood') and 'made full' ('filled'); combined as 'blood-filled' the meaning remained literal: 'containing blood', and this core sense has been preserved into modern usage.