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[dahy-awf, -of] /ˈdaɪˌɔf, -ˌɒf/
a sudden, natural perishing of large numbers of a species, population, or community.
Origin of die-off
First recorded in 1935-40; noun use of verb phrase die off Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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die-off in Science
A sudden, severe decline in a population or community of organisms as a result of natural causes. Local die-offs can be caused by such factors as an unusual or extreme weather pattern, an outbreak of disease, or toxic algal blooms in a body of water. Widespread or global die-offs in which a species or group of species becomes extinct are generally associated with rapid climate change or other large-scale environmental dislocations.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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