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Blood is thicker than water
Blood is thicker than water
Blood is thicker than water : Phrases
Meaning:
So it is, but this proverb hasn't to do with measures of viscosity. The expression, meaning that family bonds are closer than those of outsiders.
Origin:
This is first cited in Sir Walters Scott's work Guy Mannering; or the astrologer, 1815:
"Weel, blude's thicker than water; she's welcome to the cheeses and the hams just the same."
Given Scott's facility for coining new phrases it may well be that this was his own work too.