Meanings
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1
verb
dialectal: to talk rapidly, noisily, or foolishly
The impostor blattered on, asking after everyone in town.
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2
noun
a rapid noisy sound, especially loud rain or hurried talk
The blatter of rain on the roof drowned out their conversation.
Thesaurus
Etymology
Probably from or influenced by Latin blaterare, 'to chatter or babble,' reinforced by expressive English verbs ending in -er. It survives chiefly in dialect for rapid noisy talk and, as a noun, for a battering or rattling sound.