hush something up
phrasal verb with hush verb uk/hʌʃ/ us/hʌʃ/
disapproving
隐瞒，掩盖（真相）
to try to prevent people from discovering particular facts
There was some financial scandal involving one of the ministers but it was all hushed up. 发生了一件关系到一位部长的金融丑闻，但这一切全被隐瞒了。