(1)悪くなる
(2)健康が衰える
(3)grow worse; "Conditions in the slum worsened"
(4)deteriorate in health; "he relapsed"
さらに詳しく
(1)商業的・経済的活動の悪化
(2)a worsening of business or economic activity; "the market took a downturn"
(1)さらに悪くする
(2)make worse; "This drug aggravates the pain"