In a manner seeking revenge or expressing a desire to punish wrongdoing.
From 'avenging' (present participle of 'avenge') plus the adverbial suffix '-ly'. This adverb transforms the verb into a manner descriptor.
The '-ly' suffix is English's workhorse for creating adverbs, but linguists notice we often stack multiple suffixes—'aveng-ing-ly' adds three layers of meaning to the core verb, showing how English builds complexity by chaining morphemes together.
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