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mock (something) up
To create a draft, model, or simulated version of something to demonstrate how it looks or works. We mocked up a prototype of the new irrigation system to demonstrate its benefits to the city council. I sketch out the designs of our latest cars, and the engineering department mocks them up.
mock something up
to make a model or simulation of something. The engineers mocked the new car design up for the managers to see. They mocked up the new car design.
To make a model of something, especially as part of a presentation: We mocked up our ideas for the stage scenery to see if it would be hard to build. Take these building plans and mock them up for the presentation.