Let them be ashamed and brought to confusion together that rejoice at mine hurt: let them be clothed with shame and dishonour that magnify themselves against me (camp. Psalms 35:4, of which this is an enlargement, with variations, the sentiment being exactly the same).
Very similar maledictions will be found in Psalms 40:14; Psalms 70:2; Psalms 71:13; Psalms 109:29.