deteriorate
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verb no object
become progressively worse: 次第に悪くなる
〈物･状況･品質などが〉悪化する, 悪くなる(become worse); 低下する; ; 〖～ into A〗 悪化して(結局)A〈最悪の状態など〉になる
e.g. relations between the countries had deteriorated sharply: その国々の間の関係は急激に悪化した。
e.g. (as adjective deteriorating) : deteriorating economic conditions.: 悪化する経済状態
DERIVATIVES
deteriorative | -ˌrātiv | adjective
ORIGIN
late 16th century (in the sense ‘make worse’): from late Latin deteriorat- ‘worsened’, from the verb deteriorare, from Latin deterior ‘worse’.