....from the Latin word
sanguis, which means "blood." But just how did
blood beget
optimism?
...During the Middle Ages, health and temperament were believed to be governed by the balance of different liquids, or humors, in one's body...
....But those lucky people who were governed by blood were strong, confident, and ruddy (all that blood, you know) – in a word,
sanguine.
The Odd History of 'Sanguine'
www.merriam-webster.com
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