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to worsen
悪化した
This is worse.
数日 悪化した
A few days' worth.
悪化して
She got worse.
悪化させる
Population with sufficient food and clean water.
そんな状況では事態をさらに 悪化させる
The resulting civil unrest would undoubtedly aggravate the situation.
ニーナが "悪化する"と 言った途端 これよ
It's just Nina Sharp said that things were about to get a lot worse, and then about an hour later, this happened.