backdate - definition and synonyms

verb [transitive] 

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/ˌbækˈdeɪt/
present tense
I/you/we/theybackdate
he/she/itbackdates
present participlebackdating
past tensebackdated
past participlebackdated
  1. 2
    to write a date on a document or cheque that is earlier than the date when it was really written