1. dummy up的解释

1. 缄口不语：dumfound 说不出话 | dummy up 缄口不语 | dummy 哑巴

1. refuse to talk or stop talking
    fall silent

    e.g. The children shut up when their father approached

    Synonym: close upclam upshut upbelt upbutton upbe quietkeep mum

2. make a dummy of

    e.g. dummy up the books that are to be published

    Synonym: dummy