The act of splashing or spraying something; present participle of bespatter, or a noun referring to the splashing itself.
From 'bespatter' with the '-ing' suffix, which converts the verb into a gerund (noun form) or marks present participle usage, following standard English morphology.
The '-ing' form is incredibly versatile in English—in one sentence, 'bespattering the walls with paint' uses it as a present participle (verb), but 'the bespattering was unavoidable' uses it as a gerund (noun), a duality unique to English among major languages.
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