backslid
verb
Definitions
To regress; to slip backwards or revert to a previous, worse state.
Example: He felt better for a little while, before his condition started to backslide.
To shirk responsibility; to renege on one's obligations or commitments.
Example: Rich countries are backsliding on their commitment to agree to new WTO measures to help people in poor countries gain access to affordable medicines. — Oxfam press release, 24 June 2002