atrophy >> /ˈætrəfi/
Definition: [intransitive verb] (of body tissue or an organ) waste away, especially as a result of the degeneration of cells, or become vestigial during evolution.
Example: without exercise, the muscles will atrophy
Definition: [intransitive verb] Gradually decline in effectiveness or vigor due to underuse or neglect.
Example: her artistic skills atrophied from lack of use
Definition: [noun] The process of atrophying or state of having atrophied.
Example: gastric atrophy