The term 'chew the ___' can be completed with three different words: CUD, CHAT, and RAG. CUD is an acronym for CUD-chewing, which is a type of behavior exhibited by animals such as cows, sheep, and goats. This behavior involves the animal repeatedly chewing on food that has already been partially digested in order to extract more nutrients from it. CHAT is a verb meaning to converse or talk informally. Finally, RAG is a noun referring to a piece of cloth, usually made of cotton or wool, that is used for cleaning or polishing.