From Choctaw itibapishili ("(he or she is a) sibling, friend; (we) nursed together"), from itibapishi, from iti (compare Creek eta ("the same; oneself; in compounds: joined, two, each other")) + iba + pishi (compare Creek pese ("(her) breast")). The English term was first used in print in 1962 in Faulkner's The Reivers.
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