atrophy
verb [ I ] uk/ˈæt.rə.fi/ us/ˈæt.rə.fi/
（身体部位）萎缩;衰退
(of a part of the body) to be reduced in size and therefore strength, or, more generally, to become weaker
After several months in a hospital bed, my leg muscles had atrophied. 我在医院病床上呆了几个月后，腿部肌肉已经萎缩了。
In the 1980s, their political power gradually atrophied (= became weaker). 20世纪80年代他们的政治权力逐渐衰落。