It is the action of utter curses. Means to blaspheme, disown, swear, condemn, execrar, inveigh, denigrate, defame, slander, offend, hate, abhor, beat, insult.
In the religious field, specifically in the Catholic religion, some priests have been attributed a power or powers to curse a parishioner who has blasphemed.
Curse: Say an evil against someone ( ill say ) or self. Example I am a fool is a form of curse against oneself; you are a rough, hollow head, it is a form of cursing others. I inherited my mother's illness, everything I get wrong, I am a loser, etc.