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Verb: dummy up
  1. Make a mock-up or prototype version of something
    "dummy up the books that are to be published";
    - dummy
  2. [N. Amer] Refuse to talk or stop talking; fall silent
    "The children dummy up when their father approached";
    - close up, clam up, shut up, belt up, button up, be quiet, keep mum

Derived forms: dummied up, dummies up, dummying up

Type of: create, make, produce