degeneration
🇺🇸
/dɪˌdʒenəˈreɪʃn/
🇬🇧
/dɪˌdʒenəˈreɪʃn/
the process of getting worse over time
The degeneration of his eyesight made it hard for him to read.
그의 시력 악화는 독서를 어렵게 만들었다.