One of the mysteries of the English language finally explained.
1Injury or damage to blood cells, or to bone marrow cells producing these; an instance of this.
An injury resulting in bleeding; (Rugby Football) such an injury which (under the rules) necessitates the player leaving the field for treatment.
Late 19th century (in an earlier sense). From blood + injury.
blood injury/ˈblʌd ˌɪn(d)ʒ(ə)ri/
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