This is the 290th most frequent Italian word.
morto
Dead.
In this sentence, 'morto' serves as a past participle indicating the dog has died.
Il cane è morto di vecchiaia.
The dog died of old age.
Here, 'morto' is used figuratively to describe extreme exhaustion.
Sono così stanco che mi sento morto.
I am so tired that I feel dead.
In this case, 'morta' is used metaphorically to describe inactivity or lack of life in the city.