This is the 16190th most frequent Turkish word.
vurulduğunu
"Vurulduğunu" means "that (he/she/it) was shot" in English.
In this context, 'vurulduğunu' is the accusative participle form of the verb 'vurulmak', meaning 'to be shot'; it indicates a learned fact.
Hikayede ana karakterin vurulduğunu öğrendik.
We learned that the main character in the story was shot.
Here, 'vurulduğunu' stems from 'vurulmak', used in the context of something being hit or struck.
Basketbol maçında potaya sert vurulduğunu gördüm.
I saw that the hoop was hit hard in the basketball match.
The verb 'vurulmak' is applied to highlight a careful action of striking.