to go back to doing something bad when you have been doing something good, especially to stop working hard or to fail to do something that you had agreed to do倒退,退步;故态复萌(尤指不再努力工作或不做承诺过的事)
My diet was going well, but I've been backsliding a little recently.我的节食计划过去一直进展顺利,但是最近恐怕有点儿退步。