減退

(1)a change downward; "there was a decrease in his temperature as the fever subsided"; "there was a sharp drop-off in sales"

(2)下向きの変化

(3)a gradual decline (in size or strength or power or number)

(4)漸次的下降（大きさや強さ、力、数において）

(5)gradual decline in amount or activity; "weight loss"; "a serious loss of business"

(6)量または活動の段階的な低下

(7)euphemistic expressions for death; "thousands mourned his passing"

(8)死の婉曲表現

(9)a condition inferior to an earlier condition; a gradual falling off from a better state

(10)初期の条件より劣った条件

(11)先立つ状態よりも劣っていること

(12)the process of gradually becoming inferior

(13)徐々に劣っていく過程