Answer: dieoff

AnswerCrossword Clue
DIEOFFBecome extinct
DIEOFFGo extinct
DIEOFFGet closer to extinction
DIEOFFGo from endangered to extinct
DIEOFFPopulations may do it
DIEOFFBecome extinct, e.g.
dieoffa sudden decline in a population
dieoffto die sequentially either singly or in numbers so that the total number is greatly diminished
dieoffsudden, natural perishing of large numbers of a species, population, or community