退たい化か

noun, noun or participle which takes 'suru', intransitive verb

degeneration; atrophy; retrogression

Biological term for the loss of function or structure in an organism, organ, or tissue over time. Also used metaphorically for skills or abilities that decline from disuse.

• 使つかわない筋きん肉にくは退たい化かする。

  Unused muscles atrophy.

• 洞どう窟くつに住すむ魚さかなは目めが退たい化かしている。

  Fish living in caves have degenerated eyes.

noun, noun or participle which takes 'suru', intransitive verb

regression; deterioration; degeneration

General term for a decline or worsening in quality, state, or condition, often applied to society, culture, or systems. Antonym: 進化 (progress, evolution).

Antonyms: 進化

• その国くにの政せい治じは退たい化かしている。

  The country's politics are deteriorating.

• 技ぎ術じゅつの退たい化かは避さけられない。

  Technological regression is unavoidable.