To argue, quarrel, or squabble persistently or noisily over trivial matters.
From Middle Dutch brabbelen or related Germanic sources meaning 'to stammer' or 'to chatter.' The word evolved to mean arguing or babbling endlessly, suggesting both noise and pointlessness.
Shakespeare and other Renaissance writers used 'brabble' to describe pointless arguments that go nowhere—it's the perfect word for when people are technically talking but definitely not communicating.
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