dummy up
To go quiet and refuse to speak, or to make a rough model of something.
Meanings
(Informal, chiefly American) To refuse to speak or give information, especially when questioned.
"The suspect dummied up as soon as his lawyer arrived and wouldn't say another word."
To create a rough model, layout, or prototype of something.
"The designers dummied up a version of the new magazine layout for the editorial meeting."
The 'go silent' sense is primarily older American slang, often associated with underworld or crime fiction from the mid-20th century. The 'create a mock-up' sense appears in design and publishing contexts. Neither sense is common in contemporary standard English.
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Forms
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