N-UNCOUNT
变卦；倒退；故态复萌
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.
例句
...the government's backsliding on free market reforms...
政府在自由市场改革上的退缩
This may help to maintain the gains you've made and to prevent backsliding.
这或许有助于保持你所取得的进展，防止倒退。