blood-brotherhoodn.
/blʌdˈbrʌðəhʊd/, U.S. /ˌblədˈbrəðərˌ(h)ʊd/ The state or condition of being a blood brother; the relationship of one blood brother to another; (also) the pledge to treat another person as a brother. Also in extended use.
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the mind > emotion > love > [noun] > love between kinsmen > brotherly love > relationship between blood-brothers
blood-brotherhood1847
1847 Evangelical Christendom May 133/1 God of one blood, o'er all the earth, All nations of mankind hath made; Nor age, nor clime, nor hue of birth, Can this blood-brotherhood evade.
1885 H. M. Stanley Congo II. xxvi. 23 The next day we made blood brotherhood. The fetish-man pricked each of our right arms, pressed the blood out..and the black and white arms were mutually rubbed together.
1909 Daily Chron. 11 Sept. 4/6 His Majesty..will doubtless..drink a toast or two with especial reference to that blood-brotherhood between the two nations.
1937 E. Snow Red Star over China v. 195 They swore blood brotherhood in the tribal manner.
1992 F. McLynn Hearts of Darkness i. iii. 80 Baker was greeted as a brother by Ruyonga and had to agree to blood-brotherhood with him.
This entry has been updated (OED Third Edition, March 2012; most recently modified version published online December 2021).
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n.1847