arrepentirse
/arepenˈtiɾse/ · B2 · verb
to regret
😔 a- + re- + pentir: again + feel sorry (pent-) = feel sorry over and over
Spanish arrepentirse comes from Latin paenitere, to regret. Note the reflexive -se: you make yourself feel sorry. Compare English penitent and penance, which share the same Latin root.