The term 'hype up' can be broken down into four crossword solutions: TOUT (4 letters), OVERRATE (8 letters), REV (3 letters), and AMP (3 letters). TOUT is a verb meaning to promote or publicize something, often in an exaggerated way. OVERRATE is a verb meaning to give something too high of an estimation or appraisal. REV is a verb meaning to increase the speed or intensity of something. Lastly, AMP is an abbreviation for amplifier, which is a device used to increase the volume of sound. All together, these words describe the act of promoting or publicizing something in an exaggerated way, giving it too high of an estimation or appraisal, and increasing the speed or intensity of it.