[908] Therein, what is anger (kodha)?
That which is anger, being angry, the state of being angry; hatred (dosa), hating, the state of being hateful; ill will, being ill-disposed, the state of being ill-disposed; opposition, hostility; ferocity, abruptness, displeasure of the mind (citta) — this is called anger.
Therein, what is grudge (upanāha)?
Anger at the earlier time; grudge at the later time. Any such grudge — the harboring of a grudge, the state of having harbored a grudge, setting up, keeping in place, firm establishment, continued conjoining, continuous binding, the strengthening of anger — this is called grudge.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.