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spare (adj.)[spare 词源字典]: "kept in reserve, not used, provided or held for extra need," late 14c., from or from the same root as spare (v.). Old English had spær "sparing, frugal." Also compare Old Norse sparr "(to be) spared." In reference to time, from mid-15c.; sense of "lacking in substance; lean, gaunt; flimsy, thin; poor," is recorded from 1540s. Spare part is attested from 1888. Spare tire is from 1894 of bicycles; 1903 of automobiles; 1961 of waistlines.[spare etymology, spare origin, 英语词源]