hush up verb 3hush-up noun 1forms 4 verb3 •(informal) To become quiet; to cease making sounds.Hush up now; you have talked too much. •To keep secret, to prevent from becoming known.They hushed up the suicide to prevent bad publicity. •(informal) To silence.Some people say he knew too much and they killed him to hush him up. hush-up noun1 •censorship; blue-penciling formshushed up · hushing up · hushes up · hush-ups
