approver

approver

(əˈpruːvə) n1. a person who approves2. a person who proves, or offers to prove, another person's guilt3. English law a person who confesses to committing a crime and gives evidence against his or her accomplices

Thesaurus

Noun

1.

approver - an authority with power to approve authority - (usually plural) persons who exercise (administrative) control over others; "the authorities have issued a curfew"