cough up vs spit up

cough up and spit up both are verbs.

Word	Noun	Adjective	Verb	Adverb
cough up	No	No	Yes	No
spit up	No	No	Yes	No

As verbs, cough up and spit up are synonyms defined as:

cough up and spit up: discharge (phlegm or sputum) from the lungs and out of the mouth

Other synonyms of cough up include cough out, expectorate, spit out.

As verbs, cough up and spit up are synonyms defined as:

Other synonyms of cough up include pony up.

cough up (verb)	spit up (verb)
discharge (phlegm or sputum) from the lungs and out of the mouth	discharge (phlegm or sputum) from the lungs and out of the mouth
give reluctantly	give reluctantly