Deteriorate (verb)

1. To become worse or decline in quality, condition, or quantity.
2. To cause to become worse or decline in quality, condition, or quantity.
3. To cause to become weaker, less effective, or less successful.
4. To cause a decline in the condition or value of something, especially through neglect or misuse.
5. To become progressively worse or more serious over time.

Origin:

Late 16th century: from latin deteriorat- 'become worse', from the verb deteriorare, from deterior 'worse'.

Examples:

1. The quality of the food deteriorated after being left in the sun for too long.
2. The country's economy deteriorated due to inflation and high unemployment rates.
3. His health deteriorated after a long illness.
4. The roads in the city are deteriorating due to lack of maintenance.
5. The company's reputation has deteriorated due to recent scandals.