Definition of backdate verb from the Oxford Advanced American Dictionary

 

backdate

 verb
verb
NAmE//ˈbækdeɪt//
 
backdate somethingVerb Forms present simple I / you / we / they backdate
 
he / she / it backdates
 
past simple backdated
 
-ing form backdating
 
 
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to write a date on a check or other document that is earlier than the actual date compare postdate
See the Oxford Advanced Learner's Dictionary entry: backdate