substantiate
verb [ T ] formal uk/səbˈstæn.ʃi.eɪt/ us/səbˈstæn.ʃi.eɪt/
证明…属实；证实
to show something to be true, or to support a claim with facts
We have evidence to substantiate the allegations against him. 我们有证据支持对他的指控。
Reports that children had been hurt have not been substantiated. 有关儿童受到伤害的报道并未得到证实。