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spit [spit 词源字典]: spit: English has two words spit in current usage. Spit ‘eject saliva’ [OE] is one of a sizable group of English words beginning sp- which denote ‘ejecting or discharging liquid’. Others include spew [OE], spout [14], spurt [16], and sputter [16]. They all go back ultimately to an Indo- European base *spyēu-, *spyū-, etc, imitative of the sound of spitting, which also produced Latin spuere ‘spit’ (source of English cuspidor [18] and sputum [17]).

The immediate source of spit itself was the prehistoric Germanic base *spit-, a variant of which, *spāt-, produced English spittle [15] (originally spattle, but changed through association with spit). Spit for roasting things on [OE] comes from a prehistoric Germanic *spituz, which also produced German spiess and Dutch spit.
=> cuspidor, spew, spout, spurt, sputter, sputum[spit etymology, spit origin, 英语词源]
spit (v.1): "expel saliva," Old English spittan (Anglian), spætan (West Saxon), transitive and intransitive, past tense *spytte, from Proto-Germanic *spitjan, from PIE *sp(y)eu-, of imitative origin (see spew (v.)). Not the usual Old English word for this; spætlan (see spittle) and spiwan are more common; all are from the same root. To spit as a gesture of contempt (especially at someone) is in Old English. Related: Spat; spitting.
spit (n.1): "saliva," early 14c., from spit (v.1). Meaning "the very likeness" in modern use is attested from 1825 (as in spitting image, attested from 1887); compare French craché in same sense. Spit-curl (1831) was originally considered colloquial or vulgar. Military phrase spit and polish first recorded 1895.
spit (v.2): c. 1200, "put on a spit, thrust with a spit," from late Old English sputtian "to spit" (for cooking), from spit (n.2). Meaning "pierce with a weapon, transfix, impale" is from early 15c. Related: Spitted; spitting. Nares' Glossary has spit-frog "a small sword."
spittoon (n.): also spitoon, 1811, American English, from spit (n.1) + -oon. A rare instance of a word formed in English using this suffix (octoroon is another). Replaced earlier spitting box (1680s).
haemoptysis: "The coughing up of blood", Mid 17th century: from modern Latin hemoptysis, from haemo- 'of blood' + Greek ptusis 'spitting'.