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Use "corroborative" in a sentence
"They will not prosecute on the word of one witness without some kind of corroborative evidence (fair enough, one might say, but what if YOU were the witness, whose word counts for no more that the scumbag who robbed you?)"
"I'm simply saying this, we have a mountain of speculation with the icing on the top is some kind of corroborative statistical argument here."
"It's only what my dad would call corroborative evidence, or proof, "remarked William; whose father, although a blacksmith, was considered one of the best read men in Stanhope, and able to argue with"