cast a shadow over smth.

   бpocaть тeнь нa чтo-л., oмpaчaть чтo-л.

    How can it be perfect when you're thinking one thing and I another, when you have a secret big enough to cast a shadow over all your life, that you hide from me (J. B. Priestley). The past frequently cast a long shadow over this new music (Newsweek)