Blood is thicker than water
Our loyalty to our family — that is, to our blood relations — is strong no matter how we may feel about them.
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The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Examples from the Web for blood is thicker than water
Historical Examples
I wonder if I can work the blood-is-thicker-than-water touch on him for a fiver afterwards?
The Boy with WingsBerta Ruck
Idioms and Phrases with blood is thicker than water
blood is thicker than water
Family ties are closer than other relationships. For example, Nancy will drop everything to help her sister; blood is thicker than water. Alluding to the fact that water evaporates without leaving a mark whereas blood leaves a stain, this proverb was first recorded about 1412.
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.