zataškavati

1. to hush up; to cover up
   Vlast godinama zataškava tu aferu. — The authorities have been covering up that affair for years.
   Zašto stalno zataškavaš probleme umesto da ih rešiš? — Why do you keep hushing up problems instead of solving them?

The perfective is zataškati; usually used of scandals, crimes or mistakes.