悪化 あっか
akka

Noun
Suru Verb

1. deterioration; getting worse; worsening; aggravation; degeneration; corruption

Intransitive
つにつれて、天気 てんき次第 しだい悪化 あっかしつつあった。
higa tatsuni tsurete tenkiwa shidaini akka shitsutsu atta.
The weather was getting worse and worse as the day went on.