1773, "Hindu idol," later, "Hindu religious teacher" (1901), from Hindi swami "master" (used as a term of address to a Brahmin), from Sanskrit svamin "lord, prince, master, (one's own) master," from sva-s "one's own" (from PIE *s(u)w-o- "one's own," from root *s(w)e-; see idiom) + amah "pressure, vehemence."