Fetching details from the dictionary...
to sink; to go down; to set
to pass away; to die
to disappear; to vanish
to confiscate
太陽が山の向こうに没した。
The sun set behind the mountains.
その偉大な画家は八十歳で没している。
That great painter died at the age of eighty.
船が嵐の中で没するのを見た。
I saw the ship sink in the storm.