Covered with splashes or spots of liquid, mud, or other messy substances.
Past tense and past participle of 'bespatter,' with the '-ed' suffix marking the adjective form that describes a state or condition resulting from the action.
Crime scene investigators and detectives in mystery novels always describe evidence as 'bespattered with blood'—the word carries a visual punch that plain 'covered' or 'stained' just doesn't have, which is why authors love it.
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