Definition of off of in English:

off of

preposition

non-standard
  • Off; from.

    ‘I pinched this next bit off of a website somewhere’
    ‘bullets were bouncing off of the shield’
    • ‘It also takes some of the heat off of Rachel, who is given nothing to do of merit.’
    • ‘Do not tear labels off of medication or cleaners.’
    • ‘People start pulling threads off of it.’
    • ‘Being able to bounce my ideas off of other like-minded people was even more of a relief.’
    • ‘Seth proceeded to get off of the couch.’
    • ‘I think that took some of the pressure off of me.’
    • ‘We shouldn't be making money off of our everyday conversations.’
    • ‘This task took a bit longer than expected because my friend kept trying to shave a few cents off of the exchange rate to his benefit.’
    • ‘The second-year player must step up and work harder to take pressure off of his teammates.’
    • ‘Be careful not to make wholesale changes to a campaign off of a small amount of data.’
    • ‘She smiled brightly as she got off of her bicycle and skipped over and on to the porch.’

Usage

Off of is often used in place of the preposition off in contexts such as she picked it up off of the floor (compared with she picked it up off the floor). Logically parallel to the standard out of, the phrase is recorded from the 16th century (it was used by Shakespeare) and is widely accepted in American English. Nevertheless, it is regarded as incorrect in standard modern British English