替一筆錢作證的紙
兩個意思都是同一張「作證的紙」，差別只在它朝哪個方向說話：往前看，它替你把錢付出去；往後看，它證明錢已經付了。
gift or exchange ticket · noun · B1
A ticket you can use instead of money for a special purpose, such as buying food, a trip, or a gift.
禮券／兌換券
核心畫面
Picture a small slip of paper that speaks on behalf of money. The paper itself is worth nothing, but it carries an official promise, so when you hand it over at the counter it does the paying for you. A voucher can be thought of as paper that vouches: it stands there and testifies about a payment — sometimes one you are about to make with it, sometimes one that has already been made.
可以想成一張「替錢說話」的紙。紙本身不值錢，但上面帶著一個正式的保證，所以你在櫃台把它交出去，它就能替你付帳。vou…更多收起
可以想成一張「替錢說話」的紙。紙本身不值錢，但上面帶著一個正式的保證，所以你在櫃台把它交出去，它就能替你付帳。voucher 就像是一張「作證的紙」：它站在那裡，替一筆錢講話——有時講的是「這筆錢可以拿去付」，有時講的是「這筆錢已經付過了」。From the word’s history
Voucher (1520s) comes from the verb vouch, from Anglo-French voucher / Old French vocher, going back to Latin vocitare "to call to, summon insistently", a frequentative of vocare "to call" (from vox "voice"). To vouch first meant to summon someone into court as a witness, then "to support with proofs or evidence" (1570s). So a voucher is literally the paper that calls a witness — it testifies. That is why the accounting slip ("receipt from a business transaction", 1690s) and the gift ticket ("document which can be exchanged for goods or services", 1947) ended up being the same word.
voucher（1520s）來自動詞 vouch，再往上接到拉丁文 vocitare（一再呼喚、傳喚），而它來自 vocare（呼叫）、跟 vox（聲音）同根。vouch 最早是「傳人上法庭作證」，後來才變成「拿出證據擔保」（1570s）。所以 voucher 字面上就是「那張叫證人來的紙」——它的工作是作證。這也說明了為什麼會計帳上的憑單（1690s，交易收據）跟商店裡的禮券（1947，可拿來兌換貨品的單據）會是同一個字。
Online Etymology Dictionary (etymonline.com), entries "voucher" and "vouch"
One branch
原始詞典資料8 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
vouchernoun/ˈvaʊt͡ʃə(ɹ)/
- 1
A piece of paper or other token that entitles the holder to a discount, or that can be exchanged for goods and services.
- a voucher for a free kettle
- This voucher entitles the bearer to a 20% discount on frozen goods.
- 2
A receipt.
- 3
One who or that which vouches.
- To the fashionable world he cannot be a stranger […] and his having married a sister of the Duke of Leeds is a voucher for my assertion.
- She is my sister—my own father’s daughter. Well; why do I believe it? The other day I had not so much as heard the remotest rumor of her existence; and what has since occurred to change me? What so new and incontestable vouchers have I handled? None at all.
- 4
advertisingbusinessmarketingA copy of a published advertisement sent by the agency to the client as proof of publication.
- Most agencies also have a vouchers department. It is its responsibility to obtain a copy of every advertisement that appears in print. It supplies the accounts department with the relevant newspaper or magazine, which is affixed to the agency's invoice for the space.
- 5
historicalA mechanical device used in shops for automatically registering the amount of money drawn.
voucherverb/ˈvaʊt͡ʃə(ɹ)/
- 1
To establish the authenticity of; to vouch for.
- 2
To provide a vouch for (an expenditure).
- 3
To provide (a beneficiary) with a voucher.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。