causing someone or something to become dumb, unable to speak, or stupefied; making silent or speechless.
Present participle of 'bedumb', combining the causative verb with the -ing suffix to create an adjective describing the action or effect of making dumb.
The -ing form can work as both a verb and an adjective in English, which is why 'bedumbing' can describe something that's currently making you speechless or stupid.
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