To make something or someone diabolic; to cause to become extremely wicked or devilish.
Formed from diabolic + -ify (from Latin facere, 'to make'), following the pattern of verbs like 'sanctify' (make holy) and 'vilify' (make vile).
The -ify suffix is one of English's most powerful verb-making tools, transforming adjectives into action words—it's why we can 'beautify' something or 'simplify' a problem.
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