When it comes to expressing the act of chewing something well or excessively, there are many synonyms for the phrase "chew up." Some alternatives to consider include masticate, gnaw, chomp, crunch, grind, pulp, and chaw. These words all convey the physical motion of biting down and breaking apart pieces of food with one's teeth. Additionally, chew up can also refer to destroying or devouring something figuratively or metaphorically. Other synonyms for this meaning might include demolish, destroy, consume, devour, or ravage. Overall, while "chew up" is a simple and straightforward term, there are many other words that can convey similar meanings depending on the context.