Related Clues:

• Flows back, as a tide
• Starts to stink, say
• Sours
• Goes bad, as fruit
• Turns bad
• Falls back, as a tide
• Loses strength
• Languishes: slang
• Goes to the dogs
• Recedes, as the tide
• Fades or declines
• Simmers down
• Rolls out
• Turns to compost
• Loses intensity