SUBSTANTIATE

[verb] [T] [formal] - to show (something) to be true, or to support (a claim) with factsWe have evidence to substantiate allegations that corruption took place.Reports that children had been hurt have not been substantiated. substantiation [noun] [U] [formal]The lawyer found no substantiation for the accusation against his client (= no facts to support the accusation).The company produced receipts in substantiation of (= to support) its claim.