1. (verb)spit, ptyalize, ptyalise, spew, spue expel or eject (saliva or phlegm or sputum) from the mouth "The father of the victim spat at the alleged murderer"
2. (verb)spew, spew out, eruct eject or send out in large quantities, also metaphorical "the volcano spews out molten rocks every day"; "The editors of the paper spew out hostile articles about the Presidential candidate"
3. (verb)vomit, vomit up, purge, cast, sick, cat, be sick, disgorge, regorge, retch, puke, barf, spew, spue, chuck, upchuck, honk, regurgitate, throw up eject the contents of the stomach through the mouth "After drinking too much, the students vomited"; "He purged continuously"; "The patient regurgitated the food we gave him last night"
Definition of 'spew'
Webster Dictionary
1. (noun)spew that which is vomited; vomit
2. (verb)spew to eject from the stomach; to vomit
3. (verb)spew to cast forth with abhorrence or disgust; to eject
4. (verb)spew to vomit
5. (verb)spew to eject seed, as wet land swollen with frost
Definitions of spew 
