To make a low, rounded sound; to mumble or speak indistinctly.
Likely from 'bomb' or 'bombus' (buzzing sound), with the diminutive or weakening suffix suggesting a softer or less distinct version of bombilate.
This word shows how English speakers would soften and modify the more forceful 'bombilate'—'bomble' sounds gentler, almost like someone speaking unclearly, which is exactly what it means!
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