deterioration

• Fray at the edges

  To show signs of deterioration, weariness, or an impending breakdown, either literally or figuratively.

• Wear thin

  To gradually diminish in effectiveness, patience, or tolerance, often to the point of becoming exhausted or unacceptable.

• On your last legs

  To be near the end of one's strength, life, or usefulness, often due to exhaustion or deterioration.