a document that serves as evidence of some expenditure
"The accountant filed the receipt as a voucher to verify the purchase of office supplies."
A piece of paper that entitles the holder to a discount, or that can be exchanged for goods and services.
"He presented his voucher at the counter to receive half off the meal."
In plain English: A voucher is a special paper or digital code that lets you get something for free or at a discount when you show it to someone else.
"She showed her hotel voucher at the front desk to check in."
Usage: A voucher is typically a physical coupon used as proof of payment or eligibility for discounts rather than an abstract guarantee. When referring to verifying someone's character, use "vouch" instead of confusing it with the noun form that represents redeemable value.
To establish the authenticity of; to vouch for.
"The senior accountant will voucher all expenses before they are reimbursed by the company."
In plain English: To voucher something is to officially confirm that it happened by signing your name as proof.
"Please voucher for all expenses before submitting your report to the manager."
The word voucher comes from the Old French term vucher, meaning to call or summon, which entered Middle English as a verb before evolving into the modern noun. It eventually developed its current sense of serving as proof or guarantee through this shift in usage over time.