Definition of dummy up in English:

dummy up

phrasal verb

informalNorth American
  • Keep quiet; give no information.

    • ‘The function of consciousness must be in part to dummy up and shape a coherence from all the competing, conflicting subsystems that processed experience.’
    • ‘They come out after closing hours, ‘dummying up’ when the security guard passes by on his rounds.’
    • ‘Of course, such synergistic bilge is commonplace, as is the tendency to dummy up on any topic that the parent company (or any of its advertisers) might want stifled.’
    • ‘And they dummy up the quote, the application documents, the earnings statements.’