To murmur about or over something; to speak in low, indistinct tones.
From 'be-' plus 'murmur' (from Latin 'murmurare', an imitative word), creating a verb meaning to murmur extensively or repeatedly.
The verb 'murmur' came from Latin and is still common, but adding 'be-' to it created a more intense version—similar to how we say 'berate' instead of just 'rate', the prefix adds emphasis and intensity.
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