de·sue·tude /ˈdɛswɪˌtud, ˌtjud, dɪˈsuə, ˈsju-/
廢止,不用
Des·ue·tude n. The cessation of use; disuse; discontinuance of practice, custom, or fashion.
The desuetude abrogated the law, which, before, custom had established. --Jer. Taylor.
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desuetude
n : a state of inactivity or disuse