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
English-Russian Muller's dictionary 24 edition. Англо-Русский словарь Мюллера 24 редакция. 2012