I suppose he would have his Lordship's signing to this letter to be taken as a voucher for him.
I signed for each of them a voucher, on a sheet of the hotel paper, for a photograph.
Yes, sir; and what's stranger still, I have a voucher for it.
A voucher or written testimony to the truth of any statement.
"I can give you a voucher for the whole amount," says Steele.