1. （肌肉或身体其他部分）萎缩
If a muscle or other part of the body atrophies, it decreases in size or strength, often as a result of an illness.

2. （事物的尺寸、程度、影响力等由于不使用或未受到保护而）变小，退化
If something atrophies, its size, degree, or effectiveness decreases because it is not used or protected.

1. any weakening or degeneration (especially through lack of use)

Synonym: withering

2. a decrease in size of an organ caused by disease or disuse

Synonym: wastingwasting away