go back on

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go back on (see inflection at go)

  1. (transitive) To be treacherous or faithless to; betray.
    to go back on friends
  2. (transitive) To fail to keep; to renege on.
    to go back on one's promises
    • BBC News
      On Sunday Iranian President Mahmoud Ahmadinejad said his country would not go back on its nuclear programme.