die-off

noun
\ˈdī-ˌȯf \

Definition of die-off 

(Entry 1 of 2)

: a sudden sharp decline of a population of animals or plants that is not caused directly by human activity

die off

verb
\ˈdī-ˈȯf \

Definition of die off (Entry 2 of 2)

intransitive verb

: to die sequentially either singly or in numbers so that the total number is greatly diminished

First Known Use of die-off

Noun

1936, in the meaning defined above

Verb

1697, in the meaning defined above

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The first known use of die-off was in 1697

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