Evidence or testimony that confirms or supports a statement, theory, or finding. It provides additional proof that strengthens the credibility of something already asserted.
From Latin 'corroborare' meaning 'to strengthen' (cor- 'together' + roborare 'to strengthen,' from robur 'strength, oak tree'). The metaphor suggests making something as strong as oak wood through additional support.
Think 'collaborate' + 'robust' - corroboration makes your argument robust by having others collaborate in confirming it! Legal dramas always need corroborating witnesses to strengthen a case.
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