backslide
US /ˈbæk.slaɪd/
UK /ˈbæk.slaɪd/
1.
gelongsor belakang
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:
:
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My diet was going well, but I've been backsliding a little recently.