vouching
noun[U]
ACCOUNTINGuk/ˈvaʊtʃɪŋ/usin anaudit(=officialexaminationof a company’saccounts), theactivityofcheckingparticularinvoicesand otherdocumentsagainstparticularaccounts:
Thesmallcompanyclientoften doesn'tappreciatethetimeinvolvedin vouching andverifyingfiguresforaudit.