プログレッシブ和英中辞典(第4版)の解説
おとろえる【衰える】
become weaker; decline
彼の健康がめっきり衰えた
His health has declined [failed] noticeably.
年をとって記憶力［視力］が衰えてきた
My memory [eyesight] is failing with age.
彼は気力が衰えた
He has lost heart.
人気が衰えてきた
He is losing popularity.／His popularity is waning.
火勢が衰えてきたらしい
The fury of the flames seems to be 「dying down [slackening off].
商売が衰えた
My business dwindled [fell off/slumped].