A Russian or Eastern European cleaning or cleansing process, particularly in religious or cultural contexts.
From Russian chistka (чистка) meaning 'cleaning' or 'purge,' derived from the root meaning 'clean.' The term historically referred to political purges in Soviet contexts.
This word became grimly famous during the Stalin era when 'chistka' referred to brutal party purges, showing how an ordinary cleaning word can become loaded with historical tragedy and political violence.
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