What does "hang over" mean in the lyrics below? Yesterday, all my troubles seemed so far away Now it looks as though they're here to stay Oh, I believe in yesterday Suddenly I'm not half the man I used to be There's a shadow hanging over me Oh, yesterday came suddenly Why she had to go I don't know, she wouldn't say I said something wrong Now I long for yesterday Yesterday love was such an easy game to play Now I need a place to hide away Oh, I believe in yesterday Why’d she have to go? I don't know, she wouldn't say I said something wrong Now I long for yesterday Yesterday love was such an easy game to play Now I need a place to hide away Oh, I believe in yesterday