The term 'mixes up' can be described by four different crossword solutions: stirs (5 letters), garbles (7 letters), confuses (8 letters), and ADDLES (6 letters). Stirring is the act of combining ingredients together, while garbling is the act of speaking in a confused or incomprehensible manner. Confusing is the act of making something difficult to understand, and addling is the act of making someone mentally confused. All of these words describe the act of mixing up something, whether it be ingredients, words, or thoughts.