RhymeZone: set-off definitions

Definitions of set-off:

noun: That which is set off against another thing; an offset.
noun: (dated) That which is used to improve the appearance of anything; a decoration; an ornament.
noun: (law) A counterclaim; a cross debt or demand; a distinct claim filed or set up by the defendant against the plaintiff's demand.
noun: (printing) An offset.

(Definitions from Wiktionary)