Meaning

noun a person's brother or sister

noun one related by blood or origin; especially on sharing an ancestor with another

originFrom Middle English sib, sibbe, from Old English sibb (“relationship; gossip; friendliness, kindness; love, friendship, peace, concord, unity, tranquility; peace of mind; a relative, kinsman, kinswoman”), from Proto-West Germanic *sibbju, from Proto-Germanic *sibjō (“kinship”), from Proto-Indo-European *sebʰ-, *swebʰ- (“one's own”). Cognate with West Frisian sibbe (“relative, family member”),…

Etymology from Wiktionary, CC BY-SA 3.0