Correct

减退

/ jiǎntuì / 
Strokes

Definition

to ebb/to go down/to decline

Example

As a Verb

drop; go down; abate; subside

1
Zhè
这
háizi
孩子
de
的
shìlì
视力
zài
在
jiǎntuì
减退
  
。

The child's eyesight is failing.

2
Tā
他
yīn
因
huànbìng
患病
jìyìlì
记忆力
jiǎntuì
减退
  
。

His memory is blurred by his illness.

3
Gāowēn
高温
yǒusuǒ
有所
jiǎntuì
减退
  
。

The high temperature has fallen a bit.

4
Rèdù
热度
jiǎntuì
减退

one's fever has come down/abated