1.spit作“吐痰”解时,可用作不及物动词,也可用作及物动词。用作及物动词时,接名词或代词作宾语,引申可表示“吐口水以示蔑视或憎恨”。
2.spit也可作“发出突突声”解,一般指机器发出声音,可用作不及物动词,也可用作及物动词。用作及物动词时,接名词或代词作宾语。
3.spit的过去式和过去分词美式英语多用spit,英式英语多用spat。

spit at(v.+prep.)
向…吐唾沫 send liquid from the mouth, usually rudely, towards (sb)
▲spit at sb
It's very rude to spit at someone.向人吐唾沫是非常粗野的行为。

spit in(v.+prep.)
把唾沫等吐入… send liquid from the mouth into (sth)
▲spit in sth
If you spit in a Lindon bus you may be fined ￡5 .如果你在伦敦的公共汽车内吐痰可能被罚款五英镑。
If you must spit at all, please spit in the bucket provided.如果你非吐痰不可,就请吐到备好的痰桶里。

spit in eye〔face〕 (v.+prep.+n.)
蔑视某人 show a complete lack of respect for sb
▲spit in the eye〔face〕 of sb
That boy is so badly behaved that he cares nothing for manners, and spits in the eye of all the teachers.那孩子的行为恶劣,举止粗野,对所有的老师都不尊重。

spit on〔upon〕 (v.+prep.)
把唾沫吐在…上 send liquid from the mouth onto (sth or sb)
▲spit on〔upon〕 sth
Don't spit on the sidewalk.别在人行道上吐痰。

spit out(v.+adv.)
▲spit sth⇔out
1.吐出… send (sth) from the mouth
The child spat out the nasty-tasting medicine.那孩子把难吃的药从嘴里吐了出来。
He was spitting out the husks of sunflower seeds on the floor.他把瓜子皮吐在地板上。
2.愤怒地说 utter angrily or sharply
He spat out angry words at his tormentors.他厉声地咒骂着折磨他的人。
She could hardly spit out the hateful words.她恼怒得几乎无法骂出那句充满恨意的话来。

spit up(v.+adv.)
咯出… bring (sth) up from the mouth or throat with effort
▲spit sth⇔up
You'd better call the doctor, the child had been spitting up blood all morning.你最好请医生来,这孩子整整一上午都在咯血。

用作不及物动词
▲S+～(+A)
The motor coughed and spat.马达发出吭哧声和突突声。
The engine was spitting.引擎在突突地作响。
The frying pan was spitting.煎锅正发出咝咝的响声。
用作及物动词
▲S+～+n./pron.
She spit curses at me.她尖刻地咒骂我。
The injured man was spitting blood.这位受伤的人正吐着血。
After the tooth had been extracted the boy spat a lot of blood.牙齿拔掉以后,那个男孩吐出了许多血。
The guns were spitting fire.枪炮在突突地发射。
The fire spat ashes all over the floor.大火弄得满地灰尘。

spit还可用作名词,作“唾液,唾沫”解。例如:
Please clean up the spit.请把唾液打扫干净。

［词源］＜古英语spitten(吐痰)