Writing on the wall
Meanings of "Writing on the wall"
the likelihood that something bad will happen
A clear sign that something unpleasant or unwelcome is going to happen. (ref. Oxford Dictionary)
"Writing on the wall" in lyrics
Why would you wanna break a perfectly good heart?
Maybe I should've seen the signs, should've read the writing on the wall.
And realized by the distance in your eyes that I would be the one to fall.