[1] : WordNet (r) 2.0

hush up
     v 1: cover up a misdemeanor, fault, or error; "let's not
          whitewash the crimes of stalin"; "she tried to gloss
          over her mistakes" syn: whitewash, gloss over, sleek
          over
     2: cause to be quiet or not talk; "please silence the children
        in the church" syn: hush, quieten, silence, still,
         shut up ant: louden
see also:
whitewash gloss over sleek over hush quieten silence 
still shut up louden 

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