The Collaborative International Dictionary of English v.0.48:
hushed-up \hushed-up\ adj. kept secret; -- used of reports; as, hushed-up stories sometimes leak out. [WordNet 1.5]WordNet (r) 3.0 (2006):
hushed-up adj 1: (used of information or news) kept secret by using influence; "hushed-up stories sometimes leak out"