safe-keeping (n.)youdaoicibaDictYouDict[safe-keeping 词源字典]
early 15c., from safe (adj.) + verbal noun from keep (v.).[safe-keeping etymology, safe-keeping origin, 英语词源]
safecracker (n.)youdaoicibaDictYouDict
also safe-cracker, 1897, from safe (n.) + agent noun from crack (v.). Originally in reference to thieves who used dynamite.
safeguard (n.)youdaoicibaDictYouDict
late 14c., "protection, safety," from Middle French sauvegarde "safekeeping, safeguard" (13c.), from Old French salve, sauve (fem. of sauf; see safe (adj.)) + garde "a keeping" (see guard (n.)). Meaning "something that offers security from danger" is recorded from late 15c.
safeguard (v.)youdaoicibaDictYouDict
mid-15c., from safeguard (n.). Related: Safeguarded; safeguarding.
safely (adv.)youdaoicibaDictYouDict
late 13c., "without risk; without harm;" mid-14c., "without risk of error," from safe (adj.) + -ly (2).
safety (n.)youdaoicibaDictYouDict
early 14c., from Old French sauvete "safety, safeguard; salvation; security, surety," earlier salvetet (11c., Modern French sauveté), from Medieval Latin salvitatem (nominative salvitas) "safety," from Latin salvus (see safe (adj.)). Meaning "trigger-lock on a gun" is attested from 1881.

As a North American football position, first recorded 1931. As a type of score against one's own team, 1881. Safety-valve, which diminishes the risk of explosion, is from 1797; figurative sense recorded from 1818. Safety-net in literal sense (in machinery) by 1916, later of aerial circus performances (1920s); figurative use by 1950. Safety-first as an accident-prevention slogan first recorded 1873.
safety-pin (n.)youdaoicibaDictYouDict
1857, from safety + pin (n.).
saffron (n.)youdaoicibaDictYouDict
c. 1200, from Old French safran (12c.), from Medieval Latin safranum (cognate with Italian zafferano, Spanish azafran), ultimately from Arabic az-za'faran, which is of unknown origin. As a color word and an adjective, late 14c. German Safran is from French; Russian shafran' is from Arabic.
sag (v.)youdaoicibaDictYouDict
late 14c., possibly from a Scandinavian source related to Old Norse sokkva "to sink," or from Middle Low German sacken "to settle, sink" (as dregs in wine), from denasalized derivative of Proto-Germanic base *senkwanan "to sink" (see sink (v.)). A general North Sea Germanic word (compare Dutch zakken, Swedish sacka, Danish sakke). Of body parts from 1560s; of clothes from 1590s. Related: Sagged; sagging.
sag (n.)youdaoicibaDictYouDict
1580s, in nautical use, from sag (v.). From 1727 of landforms; 1861 of wires, cables, etc.
saga (n.)youdaoicibaDictYouDict
1709, an antiquarians' revival to describe the medieval prose narratives of Iceland and Norway, from Old Norse saga "saga, story," cognate with Old English sagu "a saying" (see saw (n.2)). Properly, a narrative composition of Iceland or Norway in the Middle Ages, or one that has their characteristics. Meaning "long, convoluted story" is from 1857.
sagacious (adj.)youdaoicibaDictYouDict
c. 1600, from Latin sagacem (nominative sagax) "of quick perception;" see sagacity. Related: Sagaciously.
sagacity (n.)youdaoicibaDictYouDict
c. 1500, from Middle French sagacité, from Latin sagacitatem (nominative sagacitas) "keenness of perception, quality of being acute," from sagax (genitive sagacis) "of quick perception, acute," related to sagus "prophetic," sagire "perceive keenly," from PIE root *sag- "to track down, trace, seek" (cognates: Old English secan "to seek;" see seek). Also used 17c.-18c. of animals, meaning "acute sense of smell."
sagamore (n.)youdaoicibaDictYouDict
"king or chief among some Native American tribes," 1610s, sagamo, from Abenaki (Algonquian) zogemo "chief, ruler," from the same root as sachem.
sage (n.1)youdaoicibaDictYouDict
kind of herb (Salvia officinalis), early 14c., from Old French sauge (13c.), from Latin salvia, from salvus "healthy" (see safe (adj.)). 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 (adj.)youdaoicibaDictYouDict
"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.2)youdaoicibaDictYouDict
"man of profound wisdom," mid-14c., from sage (adj.). Originally applied to the Seven Sages -- Thales, Solon, Periander, Cleobulus, Chilon, Bias, and Pittacus.
sagebrush (n.)youdaoicibaDictYouDict
1850, from sage (n.1), to which it has no biological affinity, + brush (n.2). Said to be so called for resemblance of its appearance or odor.
Sage-brush is very fair fuel, but as a vegetable it is a distinguished failure. Nothing can abide the taste of it but the jackass and his illegitimate child, the mule. ["Mark Twain," "Roughing It"]
sagely (adv.)youdaoicibaDictYouDict
c. 1400, from sage (adj.) + -ly (2).
saggy (adj.)youdaoicibaDictYouDict
1848, from sag (n.) + -y (2). Related: Saggily; sagginess.