deteriorate

英 [dɪ'tɪərɪəreɪt] 美[dɪ'tɪrɪəret]

• vi. 恶化，变坏
• vt. 恶化

1. become worse or disintegrate;

"His mind deteriorated"

2. grow worse;

"Her condition deteriorated"

"Conditions in the slums degenerated"

"The discussion devolved into a shouting match"