One of the mysteries of the English language finally explained.
Staining with blood; an instance of this.
Characterized by wounding or injury (literal and figurative); that stains something with blood.
Mid 19th century; earliest use found in The Lancet. Either from blood + staining, or from bloodstain + -ing<br>late 18th century. From blood + staining. Compare earlier bloodstained and later bloodstain.
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