One of the mysteries of the English language finally explained.
Of unmixed origin or descent, pure-blooded; genuine; unadulterated.
Unmixed origin or descent, pure blood; a pure-blooded or genuine person or thing.
In all respects, through and through; genuinely, strictly; without adulteration.
Mid 19th century; earliest use found in The Times. From French pur sang (noun) unmixed origin or descent, pure-blooded or genuine person, thoroughbred horse, (adjective) pure-blooded from pur + sang blood.
pur sang/ˌpʊə ˈsɒŋ//ˌpʊə ˈsɑːŋ/
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