Collins COBUILD Advanced Learner's English Dictionary - backsliding

If you accuse someone of backsliding, you disapprove of them because they have failed to do something they promised or agreed to do, or have started again doing something undesirable that they had previously stopped doing. ...the government’s backsliding on free market reforms... This may help to maintain the gains you’ve made and to prevent backsliding. N-UNCOUNT c darkgreen]disapproval