(verb) undergo atrophy. Synonyms: atrophy. Example: "Muscles that are not used will atrophy."
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Verb Definition 1
(adj) (of an organ or body part) diminished in size or strength as a result of disease or injury or lack of use. Synonyms: atrophied (vs. hypertrophied), wasted, diminished. Example: "Partial paralysis resulted in an atrophied left arm."