sub·stan·ti·ate 
/səbˈstænʃiˌeɪt/ verb
sub·stan·ti·ates; sub·stan·ti·at·ed; sub·stan·ti·at·ing /səbˈstænʃiˌeɪt/ verb [+ obj] formal : to prove the truth of (something)
▪ He offered no evidence to substantiate [=support] his claim.
▪ He offered no evidence to substantiate [=support] his claim.
— sub·stan·ti·a·tion /səbˌstænʃiˈeɪʃən/ noun [noncount]
/səbˌstænʃiˈeɪʃən/ noun [noncount]
