spit (v.) Look up spit at Dictionary.com
"expel saliva," O.E. spittan (Anglian), spætan (W.Saxon), from PIE *sp(y)eu-, of imitative origin (see spew). Not the usual O.E. word for this; spætlan (see spittle) and spiwan (see spew) are more common. Meaning "to eject saliva (at someone or something) as a gesture of contempt" is in O.E. The noun is attested from c.1300. Meaning "the very likeness" is attested from 1602 (e.g. spitting image, attested from 1901); cf. Fr. craché in same sense. Military phrase spit and polish first recorded 1895. Spitball is from 1846 in the schoolboy sense, 1905 in the baseball sense.
spit (n.) Look up spit at Dictionary.com
"sharp-pointed rod on which meat is roasted," O.E. spitu, from P.Gmc. *spituz (cf. M.Du. spit, Swed. spett, O.H.G. spiz, Ger. Spieß "spit," Ger. spitz "pointed"), from PIE *spei- "sharp point" (see spike (n.1)). This is also the source of the word meaning "sandy point" (1670s). O.Fr. espois, Sp. espeto "spit" are Gmc. loan-words. The verb meaning "to put on a spit" is recorded from c.1200.