'spit up' definitions:

Definition of 'spit up'

(from WordNet)
verb
Give reluctantly; "He coughed up some money for his children's tuition" [syn: cough up, pony up, spit up]
verb
Discharge (phlegm or sputum) from the lungs and out of the mouth [syn: expectorate, cough up, cough out, spit up, spit out]