Blood brother is a term used to describe a close bond between two people, usually male, that is similar to the bond of siblings. The term is often used to refer to two people who have taken a vow of loyalty to each other. The crossword solutions for the term blood brother are PAL (3 letters) and FLESH (5 letters). PAL is an informal term for a friend or companion, while FLESH refers to the physical body of a person. Together, these two words can be used to describe the strong bond between two people, as if they were brothers by blood.