backslidden

/B AE1 K S L IH1 D AH0 N/
verb
  1. 1

    To regress; to slip backwards or revert to a previous, worse state.

    โ€œHe felt better for a little while, before his condition started to backslide.โ€

  2. 2

    To shirk responsibility; to renege on one's obligations or commitments.

    โ€œRich countries are backsliding on their commitment to agree to new WTO measures to help people in poor countries gain access to affordable medicines. โ€” Oxfam press release, 24 June 2002โ€

Source: https://en.wiktionary.org/wiki/backslidden, https://en.wiktionary.org/wiki/backslide