Biology, Natural sciences An incident or episode in which a particular species or organism dies off, especially in large numbers.
A serious drought in 1785 and 1786 caused a die-off of cattle, which ruined many peasant families, especially in the south.2002, Colin Jones, The Great Nation, Penguin, published 2003, page 361:
Related terms
kill-off
die off
verb
1
To suffer a series of deaths; to die one by one; to progressively become extinct. (If a group of plants, animals, or people dies off, the entire group dies over a period of time.)
2
To become defunct or nonexistent.
The student guitar club died off after a few years.
3
Of music, noise, etc., to reduce in volume until no longer audible.