Definition of backdate in US English:

backdate

verb

[with object]
  • Put an earlier date to (a document or agreement) than the actual one.

    ‘they backdated the sale documents to evade a court order’
    • ‘The sentence was backdated to April 17, from when he had since been held in custody.’
    • ‘We don't know whether this really was a coincidence, or whether one of them tactically backdated his declaration, so they share the honor.’
    • ‘It turns out that the phony diplomas were backdated.’
    • ‘I was going to put up a post and just backdate it to yesterday, but I decided that would be pretty bootleg.’
    • ‘He writes that he was backdating the Officer Efficiency Training report.’
    • ‘Most of the agreements and other documents were backdated and there is uncertainty with respect to the actual dates on which - and the order in which - some of them were executed.’
    • ‘Analysis of the ink in a lab notebook, for example, might turn up backdated entries or other mischief.’
    • ‘The ‘approval’ document was cobbled together long after the experiment concluded and was then backdated, the other doctor said.’

Pronunciation

backdate

/ˈbakˌdāt//ˈbækˌdeɪt/