To make a croaking sound around or throughout; to fill with croaks or harsh sounds.
From 'be-' plus 'croak' (the harsh cry of a frog or raven); follows the pattern of 'be-' plus onomatopoeia.
Shakespeare and his contemporaries loved onomatopoetic 'be-' words—'becroak' appears in descriptions of swamps and dark places filled with the sound of frogs, creating atmospheric vividness.
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