Etymology
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mock-up (n.)

also mockup, "model, simulation" 1919, perhaps World War I, from the verbal phrase mock up "make an experimental model" (1911), from mock (v.) + up (adv.).

updated on February 07, 2019

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Definitions of mock-up from WordNet

mock-up (n.)
full-scale working model of something built for study or testing or display;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.