(of body tissue or an organ) waste away, especially as a result of the degeneration of cells, or become vestigial during evolution

the calf muscles will atrophy

gradually decline in effectiveness or vigour due to underuse or neglect

the imagination can atrophy from lack of use

the process of atrophying or state of having atrophied

gastric atrophy

extensive TV viewing may lead to atrophy of children's imaginations