Recreancy, apostasy.

Turning aside, falling away; = declension, n. 2.

A turning aside, swerving, deviation from a standard; turning aside (from rectitude, etc.); falling away; = declension, n. 2. Obsolete.

With verbal nouns forming nouns, as backsliding, n., back-coming, back-drawing, back-going, back-looking, back-slipping, back-starting, back-surging…

An act of abandoning or renouncing something; a defection. Also with from. Obsolete.

A change of allegiance (to or from a friend, a party, a faith, etc.) or opinion. Now rare.

The action of to fall off at fall, v. phrasal verbs 1 (in various senses); an instance of this.

By extension: The abandonment of principles or party generally.

The action of ‘turning one's back on’, i.e. forsaking, something in which one was previously engaged, interested, or concerned; desertion or…

figurative. Deviation or declining from a standard; falling away (from one's allegiance), apostasy.

The quality of being recreant; apostasy, treachery; mean-spiritedness.

The action of start, v. (in various senses); an instance of this.

The action or an act of departing from some state, standard, or mindset; disaffiliation from an association, agreement, etc. Also: an instance of…

= recreancy, n.

The formal renunciation or dissolution of a relationship of amity, trust, allegiance, or fealty; = defiance, n. 1.

= withdrawal, n. in various senses; formerly spec. the withdrawal of divine illumination.

(a) n. tergiversation, evasion; (b) adj. apostatizing, renegade; †recusant; evasive, shifty.

fig. Conversion; perversion; desertion to another side (quot. 1665). arch.

Desertion of a party, cause, principle, etc. Formerly with over.

The behaviour and practices of a renegade.

The action or fact of deserting a person, party, organization, cause, or country, esp. in favour of an opposing one; the action or fact of defecting…

the action or practice of a turncoat.