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Wiktionary
dream up

vb. To have an imaginative, unusual or foolish idea, to invent something unreal.

WordNet
dream up

v. devise or invent; "He thought up a plan to get rich quickly"; "no-one had ever thought of such a clever piece of software" [syn: think up, think of, hatch, concoct]

Usage examples of "dream up".

Those early carmakers were simply lucky, in that they could dream up whatever interface was best suited to the task of driving an automobile, and people would learn it.