The term 'SMARTEN UP' can be broken down into six crossword solutions: TITIVATE (8 letters), PRIMP (5 letters), SPRUCE (6 letters), SPIFF (5 letters), PREEN (5 letters), and GETWISE (7 letters). TITIVATE means to make something look more attractive, usually through decoration or adornment. PRIMP means to groom oneself carefully, often in preparation for a special occasion. SPRUCE means to make something look neat and tidy. SPIFF means to make something look more attractive or stylish. PREEN means to groom oneself with pride and satisfaction. Finally, GETWISE means to become more knowledgeable or informed. All of these words are related to the idea of making oneself or something else look better, which is the overall goal of the phrase 'SMARTEN UP'.