The story
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Blood flow exiting the nostrils that is not due to a true nosebleed, that is, not truly originating from the nasal cavity; examples include blood coughed up through the airway and ending up in the nasal cavity, then dripping out. Full definition →
Etymology from Wiktionary, CC BY-SA 4.0.