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Wiktionary
spit up

vb. (context transitive and intransitive especially of children English) To regurgitate or vomit.

WordNet
spit up
  1. v. give reluctantly; "He coughed up some money for his children's tuition" [syn: cough up, pony up]

  2. discharge (phlegm or sputum) from the lungs and out of the mouth [syn: expectorate, cough up, cough out, spit out]