1) Corroded 2) Gone south 3) Gone to pot 4) Gone to seed 5) Ran to seed 6) Wenttopot 7) Wore 
• (imp. & p. p.) of Deteriorate
deteriorate, deteriorates, deteriorating, deteriorated 1. To become or to make something worse in quality, value, or strength. 2. To diminish or to impair in quality, character, or value. 3. To grow worse in function or condition; to degenerate. 4. To weaken or to disintegrate; to decay.