The term STIRS (UP) can be broken down into twelve crossword solutions, each with a different number of letters. FOMENTS (7 letters) means to encourage or promote something, REVS (4 letters) means to increase the speed of an engine, PEPS (4 letters) means to invigorate or energize, STOKES (6 letters) means to stir up or fan the flames of, AROUSES (7 letters) means to awaken or excite, ROILS (5 letters) means to cause confusion or turmoil, INCITES (7 letters) means to provoke or urge on, IRES (4 letters) means to make angry, RILES (5 letters) means to agitate or annoy, AWAKES (6 letters) means to rouse from sleep, ROUSES (6 letters) means to arouse or excite, ROUSTS (6 letters) means to force out of bed, SPARKS (6 letters) means to ignite or kindle, and WAKENS (6 letters) means to arouse from sleep. All of these words are related to the idea of stirring something up, whether it be an emotion, an action, or a physical object.