1
a voucher for [something]
She received a voucher for a free haircut.
她收到一张免费理发的代金券。
证人；保证人；证明者
先理解核心含义，再看它在真实句子里的用法。
证人；保证人；证明者
a person who vouches for another or for the correctness of a statement
She received a voucher for a free haircut.
她收到一张免费理发的代金券。
这里指担保或作证的人，而非代金券、凭证。
代金券；兑换券
A piece of paper or other token that entitles the holder to a discount, or that can be exchanged for goods and services.
为他人或陈述的正确性作担保的人
someone who vouches for another or for the correctness of a statement
收据。
A receipt.
作为某项支出的证明文件
a document that serves as evidence of some expenditure
My neighbor agreed to be a voucher for me when I applied for the library card.
我申请借书证时，邻居同意做我的证明人。
During the recruitment process, his former teacher acted as a voucher for his honesty.
招聘过程中，他以前的老师为他的诚实作了证明人。
Her old colleague served as a voucher for her work experience in the job application.
在她的求职申请中，她的老同事为她的工作经历做了证明人。
She received a voucher for a free haircut.
她收到一张免费理发的代金券。
He used a voucher to buy the book.
他用一张代金券买了这本书。
动词用法较正式，常见于书面语。
The expert vouchered the authenticity of the painting.
专家证实了这幅画的真实性。
Not this
I need voucher to get discount.
Use this
I need a voucher to get a discount.
学生常忽略可数名词前需要加冠词；'voucher'为可数名词，因此应有不定冠词'a'。
Not this
She vouchers for his identity.
Use this
She vouches for his identity.
'voucher'作为动词不标准，正确动词是'vouch'，搭配介词'for'表'担保'。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
礼品券
I received a gift voucher for my birthday.
我生日时收到了一张礼品券。
旅行代金券
She used a travel voucher to book the hotel.
她用一张旅行代金券预订了酒店。
兑换代金券
You can redeem this voucher at any store.
你可以在任何一家商店兑换这张代金券。
代金券代码
Enter the voucher code at checkout to get a discount.
在结账时输入代金券代码即可获得折扣。
餐券
Employees receive a meal voucher each shift.
员工每班次会收到一张餐券。
Use voucher naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象代金券（voucher）是一张保证书，可兑换物品。
语境：商业/零售，如代金券、礼品券。常用于促销或企业福利场景，比较正式。
All these words end with '-cher' spelled /tʃɝ/, but note that the vowel sound before the ending varies: /iː/ in teacher and preacher, /æ/ in catcher, /ɪ/ in pitcher, /ʊ/ in butcher, /ɛ/ in stretcher. Voucher itself has /aʊ/, so none rhyme exactly with it.
Dictionary facts from ECDICT, WIKTIONARY.