Sage
Middle English: from Old French sauge, from Latin salvia ‘healing plant’, from salvus ‘safe’.
wiktionary
From Middle English sage, from Old French sage (11th century), from Latin *sapius, from Latin sapere(“to taste, to discern, to be wise”), from Proto-Indo-European *sap-(“to taste”). The noun meaning "man of profound wisdom" is recorded from circa 1300. Originally applied to the Seven Sages of Greece.
From Middle English sauge, from Middle French sauge, from Old French salje, from Latin salvia, from salvus(“healthy”), see safe.
Borrowed from Japanese sage, from Japanese 下げる(sageru, “to lower”). From 2channel.
etymonline
sage (adj.)
"wise," c. 1300 (late 12c. as a surname), from Old French sage "wise, knowledgeable, learned; shrewd, skillful" (11c.), from Gallo-Roman *sabius, from Vulgar Latin *sapius, from Latin sapere "have a taste, have good taste, be wise," from PIE root *sap- "to taste" (see sap (n.1)). Meaning "characterized by wisdom" is from 1530s. Related: Sageness.
sage (n.1)
kind of herb (Salvia officinalis), early 14c., from Old French sauge (13c.), from Latin salvia, from salvus "healthy" (from PIE root *sol- "whole, well-kept"). So called for its healing or preserving qualities (it was used to keep teeth clean and relieve sore gums, and boiled in water to make a drink to alleviate arthritis). In English folklore, sage, like parsley, is said to grow best where the wife is dominant. In late Old English as salvie, directly from Latin. Compare German Salbei, also from Latin.
sage (n.2)
"man of profound wisdom," mid-14c., from sage (adj.). Originally applied to the Seven Sages -- Thales, Solon, Periander, Cleobulus, Chilon, Bias, and Pittacus.
