Spit (sth) up is a common term used to describe a situation where a person expels food or liquid from their mouth. This can happen due to various reasons, including coughing, gagging, or simply not being able to swallow properly. There are several synonyms for this term, including regurgitate, vomit, puke, hurl, heave, and retch. While all of these words describe the act of expelling substances from the mouth, there may be slight differences in their meanings. For example, retch refers to the act of vomiting without actually expelling anything, while hurl connotes a more forceful or violent expulsion of substances.