counterfoil
/ˈkaʊntərˌfɔɪl/
noun
- The part of a check, ticket, or receipt that is kept as a record by the person who issued it.
- Keep the counterfoil in case you need to prove you paid the bill.
- The ticket counterfoil shows the date and seat number for the concert.
- After writing the check, she tore off the counterfoil and put it in her wallet.