Past tense of 'bloviate'; spoke at great length in a pompous manner.
Regular past tense formation of 'bloviate,' using the '-ed' suffix to mark completed action in the past.
The rise of 'bloviated' in modern headlines shows how English adapts—it's not in all dictionaries even today, but journalists and commentators use it constantly because it perfectly captures the feeling of someone speaking confidently about nothing.
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