وَالطَّاعِنِينَ مَجَامِعَ الْأَضْغَانِ
Those thrusting into the gathering-places of rancor; that is, into hearts.
Al-adghan is the plural of *dighn*, concealed rancor or hostility. Majami‘ means gathering-places. Those supposed locations indicate hearts; the intended target is an organ, so this is kinayah for a referent.
Although rancor is the quality mentioned, the thing inferred is the heart, not a claim that someone is rancorous. That is why the classification depends on the intended meaning.