وَ«شَرٌّ أَهَرَّ ذَا نَابٍ».
Translation: Some evil made a fanged creature growl.
شَرٌّ: nominative, indefinite mubtadaʾ.
أَهَرَّ: past verb with an implicit subject pronoun referring back to «شَرٌّ».
ذَا: accusative object marked by alif, from the six special nouns; it is muḍāf.
نَابٍ: genitive muḍāf ilayh. The verbal clause functions as khabar.
This is an idiomatic proverb; context and useful predication support the indefinite topic.
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Mubtadaʾ and Khabar — Definition and Foundational Rules
وَ«شَرٌّ أَهَرَّ ذَا نَابٍ».
Translation: Some evil made a fanged creature growl.
شَرٌّ: nominative, indefinite mubtadaʾ.
أَهَرَّ: past verb with an implicit subject pronoun referring back to «شَرٌّ».
ذَا: accusative object marked by alif, from the six special nouns; it is muḍāf.
نَابٍ: genitive muḍāf ilayh. The verbal clause functions as khabar.
This is an idiomatic proverb; context and useful predication support the indefinite topic.