0 past simple and past participle of deteriorate
Unfortunately the survey shows that children's health is deteriorating in many areas.
As the company's financial outlook deteriorated, several directors resigned.
We knew that, for the children's sake, we had to prevent our relationship from deteriorating any further.
When an older person's condition deteriorated, the helpers often had to provide more support.
Elemental analyses of this deteriorated wood showed high levels of copper, chromium, iron, and lead, suggesting that a caustic chemical spill had occurred.
Our methods appear to permit this dependence, but at the expense of a badly deteriorated error estimate.