The term INTENSIFIES, WITH 'UP' can be broken down into three crossword solutions: AMPS (4 letters), HEATS (5 letters), and REVS (4 letters). AMPS stands for 'amperes, ' which is a unit of electrical current. When the amperes increase, the intensity of the current increases, or intensifies. HEATS stands for 'heating, ' which is the process of increasing the temperature of an object. When the temperature increases, the intensity of the heat increases, or intensifies. REVS stands for 'revolutions, ' which is the number of times a rotating object turns around its axis. When the revolutions increase, the intensity of the rotation increases, or intensifies.