voucher
US /ˈvaʊ.tʃɚ/
UK /ˈvaʊ.tʃɚ/

1.
bon, coupon
a small printed piece of paper that entitles the holder to a discount, or that can be exchanged for goods or services
:
•
I have a discount voucher for the new restaurant.
J'ai un bon de réduction pour le nouveau restaurant.
•
You can redeem this voucher for a free coffee.
Vous pouvez échanger ce bon contre un café gratuit.
2.
justificatif, pièce comptable
a document recording a sum of money spent or advanced
:
•
Please submit all expense vouchers by Friday.
Veuillez soumettre tous les justificatifs de dépenses avant vendredi.
•
The accountant reviewed the payment vouchers.
Le comptable a examiné les pièces justificatives de paiement.
1.
attester, garantir
to confirm or support something with evidence
:
•
His testimony will voucher for her innocence.
Son témoignage attestera de son innocence.
•
Can you voucher for the authenticity of this document?
Pouvez-vous garantir l'authenticité de ce document ?