а. отмирать б. умирать один за другим The trees-have been dying off during the severe winter, and there are few left. The deer in the forest are all dying off from disease.
DIE OFF
Англо-русский перевод DIE OFF
Мюллер. English-Russian Muller's dictionary bed edition. Англо-Русский словарь Мюллера редакция bed. 2012