Counter-foil or counterfoil means the part of a cheque, receipt, or ticket that is retained by the issuer as a record. Some antonyms for the word counter-foil would be, discard, destroy, or delete, which all suggest the complete wiping out or removal of a record. Another antonym could be "endorsement," which suggests adding more information to the record or expanding upon it. "Deny" could also be an antonym, indicating a refusal to acknowledge the record or the information contained within it. In any case, antonyms for counter-foil are words that suggest a different approach to the record-keeping process or the information contained therein.