不及物动词
1. （使）变得更坏(或更糟);（使）恶化
If a bad situation worsens or if something worsens it, it becomes more difficult, unpleasant, or unacceptable.
1. grow worse
e.g. Conditions in the slum worsened
Synonym: decline
2. make worse
e.g. This drug aggravates the pain
Synonym: aggravateexacerbateexasperate