The term SPED UP can be summarized by five different crossword solutions: HASTENED (8 letters), EXPEDITED (9 letters), ACCELERATED (11 letters), REVVED (6 letters), and FLOOREDIT (9 letters). All of these words refer to the act of increasing the speed of something, either in terms of physical motion or in terms of the rate of progress. HASTENED and EXPEDITED are both verbs that mean to speed up a process or activity, while ACCELERATED is an adjective that describes something that has been sped up. REVVED is a verb that means to increase the speed of an engine, and FLOOREDIT is a verb that means to press the accelerator of a car to its maximum speed.