Definitions
There are 2 meanings of the phrase
Blood Brother.
Blood Brother - as a noun
A male with the same parents as someone else
Example: "My brother still lives with our parents"
Synonyms (Exact Relations)
brotherHypernyms (Closely Related)
male siblingHyponyms (Broadly Related)
A male sworn (usually by a ceremony involving the mingling of blood) to treat another as his brother
Example Sentences
"They formed a bond and became blood brothers."
"Growing up, they considered each other blood brothers."
"According to their culture, the two warriors became blood brothers after the ceremony."
"He considered his childhood friend to be his blood brother."
"The two families were blood brothers and shared a deep connection."