This is the 2344th most frequent Russian word.
напал
"Напал" means "attacked" in English.
The word 'напал' describes an attack or assault initiated by the subject of the sentence on someone or something.
На человека напал медведь.
A bear attacked the person.
Here, 'напал' is used idiomatically to describe coming upon or discovering something unintentionally.
Я случайно напал на старую фотографию.
I accidentally came across an old photograph.
This usage of 'напал' metaphorically conveys a gentle and encompassing action.