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think something up
to contrive or invent something. Don't worry. I'll find a way to do it. I can think something up in time to get it done. John thought up a way to solve our problem.
think up somethingalso think something up
to invent something She used to think up funny things just to make him laugh. Sitting in the school yard, I thought up a scheme to get the older boys on my side. They had to do something fast, and they were smart to actually think that up.Related vocabulary: dream up something
Devise, contrive by thinking, as in She's an expert at thinking up interesting programs. [Mid-1800s]
To devise or develop something: She thought up a plan to make more money. He thought the design up all by himself.