Spew forth is a phrase that often brings to mind a violent outpouring of something unpleasant. There are several synonyms for spew forth that can be used to convey this same sense of forceful expulsion. One option is to use the phrase "belch out," which emphasizes the sudden and forceful nature of the action. "Vomit forth" is another option, which adds a sense of revulsion. A third choice is "gush forth," which implies a more steady stream of something flowing out. No matter which synonym for spew forth is used, the feeling of an uncontrollable and intense expulsion remains the same.