dummy up

listen to the pronunciation of dummy up
English - English
To make a mock-up or prototype version of something, without some or all off its intended functionality

The carpenters dummied up a set of simple props for the rehearsals.

To not answer questions

When he couldn't think of any more good lies, he just dummied up.

(deyim) Shut up, dry up, dumb up, pipe down, ring off
{f} shut up, remain quiet, keep silent; refuse to answer; refuse to talk
dummy up
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