Making murmuring sounds; speaking in low, indistinct tones repeatedly.
The present participle of 'bemurmur', formed with '-ing' to show the ongoing or repeated action of murmuring.
The '-ing' form here is fascinating because it captures a continuous action—'bemurmuring' suggests people endlessly murmuring, like a background sound, which is more evocative than a simple 'murmur'.
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