To regress; to slip backwards or revert to a previous, worse state. / To shirk responsibility; to renege on one's obligations or commitments.

(organic chemistry) The linear oxocarbon having five carbon atoms

(grammar) Of or relating to the sublative case. / Having power, or tending, to take away.

(critical theory) A metanarrative; a narrative that provides legitimation of some, given set of narratives and that is itself self-legitimising.