To shout at or overwhelm with loud noise and clamor.
From the prefix 'be-' (meaning to make or cause to be) plus 'clamour' (loud noise or shouting); the combination means to cover or surround with clamor, dating back to Middle English usage.
The 'be-' prefix was incredibly productive in Middle English—it could be added to almost any verb or noun to create a new word meaning 'to cover with' or 'to make into,' which is why we have so many archaic 'be-' words in English.
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