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Verb: renege on
  1. Fail to fulfil a promise or obligation
    "she reneged on her promise";
    - renege, renegue on, go back on, renegue [Brit]

Derived forms: reneged on, reneging on, reneges on

Type of: annul, countermand, lift, overturn, repeal, rescind, reverse, revoke, vacate