up
to hide information about a situation because you do not want people to know about it :
He claimed that the whole affair had been hushed up by the council.
up
to hide information about a situation because you do not want people to know about it :
He claimed that the whole affair had been hushed up by the council.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005