A cursed thing, i.e. devoted to utter destruction, as that was. See Joshua 7:11,21,24, &c.
Related Commentaries of Deuteronomy 7:26
Deuteronomy 7:26
26 Neither shalt thou bring an abomination into thine house, lest thou be a cursed thing like it: but thou shalt utterly detest it, and thou shalt utterly abhor it; for it is a cursed thing.