What does approver mean?
The definition of approver
Ap*prov”er, n.
1 One who approves. Formerly, one who made proof or trial.
2 An informer; an accuser. [Obs.] Chaucer.
3 (Eng. Law)
One who confesses a crime and accuses another. See 1st Approvement, 2.
Ap*prov”er, n.
Etym: [See 2d Approve, v. t.] (Eng. Law)

A bailiff or steward; an agent. [Obs.] Jacobs.