by 1984, from dialectal pronunciation of Italian compare "companion, godfather" (compare compadre).
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compadre n.
"companion," 1834, American English, from Spanish compadre "godfather," hence "benefactor, friend," from Medieval Latin compater, from com "with, together" (see com-) + pater "father" (see father (n.). Compare compere, compeer, also gossip (n.).