What does 悪化 mean?
悪化 is a Japanese noun meaning “deterioration, worsen” in English. It is written as 悪化 in kanji, あっか in hiragana, and akka in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
日が経つにつれて、天気は次第に悪化しつつあった。
The weather was getting worse and worse as the day went on.