To mix together thoroughly; to cause to blend or associate closely with others.
From 'be-' prefix plus 'mingle,' from Old English 'mengan.' The 'be-' prefix emphasizes the thoroughness or completeness of the mixing action.
Interestingly, 'mingle' still thrives in modern English while its 'be-' variant has faded—but 'bemingle' more forcefully suggests an enforced or complete blending, almost implying you can't separate them afterward.
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