Summon up is an expression that means to call forth or bring into existence. The crossword solutions for this term are RAISE (5 letters), EVOKE (5 letters), MUSTER (6 letters), ELICIT (6 letters), and INVOKE (6 letters). RAISE means to lift up or increase, while EVOKE means to bring to mind or call forth. MUSTER means to assemble or gather together, while ELICIT means to draw out or EVOKE. Finally, INVOKE means to call upon or appeal to. All of these words can be used to describe the act of summoning something up.