Thinking up ideas is a creative process that involves coming up with new concepts or solutions. The crossword solutions for the term THINK UP include INVENT (6 letters), CONCEIVE (8 letters), COIN (4 letters), DEVISE (6 letters), IDEATE (6 letters), CONCOCT (7 letters), and ENGINEER (8 letters). All of these words refer to the act of creating something new, whether it be an invention, a plan, or a solution. Each word has its own nuances, but all of them involve the process of thinking up something original.