"atrophy" in the noun sense
1. atrophy, wasting, wasting away
a decrease in size of an organ caused by disease or disuse
2. atrophy, withering
any weakening or degeneration (especially through lack of use)
"atrophy" in the verb sense
1. atrophy
undergo atrophy
"Muscles that are not used will atrophy"
Source: WordNet® (An amazing lexical database of English)
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