♣ hush up　(v.+adv.)
防止…张扬出去，掩盖hide information about a situation because you do not want people to know about it
　He tried to hush up the fact.　他试图掩盖事实。

vt. & vi.（使）安静下来　(cause to) be silent and calm

S U 安静，寂静　silence, especially a peaceful one

　A hush fell over the onlookers.　旁观者们突然静了下来。