To discuss something thoroughly with others to reach understanding or make a decision.
This phrase emerged in the 18th century, using 'over' to suggest comprehensive coverage of a topic through conversation. It reflects the democratic ideal that important matters should be discussed rather than decided unilaterally.
The collaborative spirit of this phrase reflects humanity's social nature - we instinctively know that talking through problems often reveals solutions that solitary thinking might miss. It's democracy in miniature, applied to everyday decisions.
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