going out of use; becoming obsolete; falling into disuse
Refers to something becoming outdated, unfashionable, or no longer practiced. Often used in the phrase 廃りになる.
This custom has already fallen into disuse.
Old machines become obsolete with technological progress.
The noun form of the verb 廃れる (すたれる), meaning 'to become obsolete'. The kanji 廃 means 'abolish' or 'disuse'.