S: (v) collapse (collapse%2:30:00::) (lose significance, effectiveness, or value) "The school system is collapsing"; "The stock market collapsed"
S: (v) fade (fade%2:30:02::), melt (melt%2:30:05::) (become less clearly visible or distinguishable; disappear gradually or seemingly) "The scene begins to fade"; "The tree trunks are melting into the forest at dusk"