izginuti

1. (of many or all) to perish; to be killed
   U tom ratu izginulo je pola sela. — Half the village was killed in that war.
   Svi vojnici su izginuli u jednoj bici. — All the soldiers perished in a single battle.
2. (of plants, animals) to die off
   Od mraza je izginulo sve cveće u bašti. — All the flowers in the garden died off from the frost.

Unlike poginuti, it usually implies that many or all died.