Plural form; instances or occurrences of violent, uncontrolled behavior, or people behaving in such a manner.
The noun form created from the adverb amuck by nominalizing it and adding the plural suffix -s. This allows amuck to function as a countable noun describing specific incidents.
Creating plural forms of words that started as adverbs shows how English evolves—language users naturally make plurals even when the original word wasn't designed as a countable noun!
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