Word Origin & History
O.E. sparian "to refrain from harming, to allow to go free," from the source of O.E. spær "sparing, frugal," from P.Gmc. *sparaz (cf. O.Fris. sparia, O.N. spara, O.H.G. sparon "to spare"). Meaning "to dispense from one's own stock" is recorded from early 13c. The adj. meaning "additional, extra"
is attested from c.1300. In ref. to time, from 1610; sense of "flimsy, thin" is recorded from 1540s. Spare part is attested from 1888. The noun meaning "extra thing or part" is from 1640s. Bowling sense of "a knocking down of all pins in two bowls" is attested from 1849, Amer.Eng.